Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f90a927ed2b2bb…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 08:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1b7f52899b2fadd29fb4f07259d70f41 SHA-1: 2b5946b79fb7469ff8eb650fca66e71a3d69155e SHA-256: c1f90a927ed2b2bbfc24ed1695ca8c3eb3b7592a4602e6bf0215b7db221ff312
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains multiple external links, including one identified as an SEO redirector for free downloads, suggesting a lure to a malicious site. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/strik?utm_term=manual+control+remoto+rca+systemlink+4 PDF link annotation
    • https://cdn.sqhk.co/kululojilo/Bhhjdjd/5613405193.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/jiixgjB/spectacular_tubers_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/sBLWwjd/funny_videos_try_not_to_laugh_impossible_clean.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hehdYg0/jumia_black_friday_deals_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_5680fdb90f7e4e648c0d0e2f69221ec1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/canon_lide_110_scanner_software.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_d7a34f875ef94156b02e906734518bec.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_544bf5a214a2465e9484189fe2568421.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/galokasak.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_8e9e35322933416aa102ca5bdacc56f9.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_8d410c2fdf06477a9f515085c00aabb7.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_6144b596f3f14e51b6864c8dacd96775.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_efd6974a616d43c3a6653897211a00e7.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_c36ca5b2de4d4ee99b061f0aa6ac8903.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_a19f010d7dd040d7beaf7bc774c86918.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/sweet_dreams_piano_sheet_music.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_a5c539d7e42b4d16bc9e5a0c858807ac.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_e059d10930a04e248ce105dd5b94eecd.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_95d16bd050724d85ae309b831f91c114.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_d4c74c2e50ab46b6aa3edf3dc66c1751.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_4ad75858616c4e6ca42007dc4dfbcc8c.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_c4860bcf7d654c2099bd125c97af1504.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/82177612592.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/hp_officejet_pro_8600_plus_screen_not_working.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5088 bytes
SHA-256: 1e28bfdf295d5e94c6a0b350d46c8da23adfda4c891ac3924720bd43f60abc18
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10336 bytes
SHA-256: bd553c72f1afd924acff5071422ebbb1544d6086f89cdd783b2d414c02786f6e
font_02_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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