Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bc3a0b99da9706…

MALICIOUS

PDF

90.6 KB Created: 2021-03-29 02:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c838a758dc10d49e68b60b8521bf11ad SHA-1: cdd8fee925de40601aedcc773a68dcda18af4b4f SHA-256: 09bc3a0b99da9706d0189a1e5fdc13f3c8c8280186180949064a3d7d2f0296fc
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of link farms designed for SEO manipulation. The heuristic firings indicate the PDF is designed to redirect users to potentially harmful content, masquerading as educational material. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=halloween+coordinate+graphing+worksheets+pdf In PDF document text
    • http://hookup750.website/kofanenemufuvapefexopepu2mwkt.pdfIn PDF document text
    • https://demepeli.weebly.com/uploads/1/3/4/6/134632839/5482264.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/7575747.pdfIn PDF document text
    • https://tonusawojojumo.weebly.com/uploads/1/3/1/3/131384735/f73ef3a29c.pdfIn PDF document text
    • https://tobedetileva.weebly.com/uploads/1/3/5/3/135337372/vuvil.pdfIn PDF document text
    • https://febavezexiwajo.weebly.com/uploads/1/3/4/7/134703432/latuvolufovel.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/adobe_acrobat_reader_dc_free_viewer_download.pdfIn PDF document text
    • http://scandisvet.ru/66005001133pwxzm.pdfIn PDF document text
    • http://sentytld.online/asus_mx279h_price_in_pakistanv47oc.pdfIn PDF document text
    • https://nagiwavimev.weebly.com/uploads/1/3/4/6/134612684/316a53c1bec40d.pdfIn PDF document text
    • http://help-violation.com/sisimugugoragelezet3g6cf.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/age_markers_in_the_human_skeleton.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/474731.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
    • http://bufixel.rf.gd/bakotazoworusud.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/wefutugawunarixobi.pdfIn PDF document text
    • http://fasotizut.rf.gd/basic_domestic_electrical_wiring.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/how_to_fix_car_ac_compressor_leak.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/what_to_say_when_a_long_lost_friend_contacts_you.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/what_is_the_main_function_of_technical_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/71344383135.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 5324 bytes
SHA-256: 512d75099f52bc48016d2dee76041fd4870483117a8e93d846dc60e037234098
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 11792 bytes
SHA-256: b0cfcd83e090631a74687ba165b69986264cbb20f3ebe3ffdccaa4870cbee111
font_03_sfnt_off00014e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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