Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ae7bbb17a8608e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 11:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ab679aab5a1bc86dd5f7a39b5cb54002 SHA-1: 20b2e88b293c1b27a6bf4c505bad4b5eda4803a2 SHA-256: c8ae7bbb17a8608e14c1ad74e0e7ccb63a9a1a8648d795330be6216e4be4e30e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are SEO-themed PDF links, suggesting a link farm or phishing operation. The embedded URLs point to suspicious domains, likely serving as lures for users to click through, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=timex+ironman+watch+band+keeper PDF link annotation
    • http://biolinkus.me/mango_footwear_size_guide5a5bz.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/when_did_the_moto_g6_play_come_out.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/519010373.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/ccna_demo_exam.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/33603217399.pdfIn PDF document text
    • https://viluvaxev.weebly.com/uploads/1/3/5/9/135974466/gapim.pdfIn PDF document text
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/2361c0fa450470.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/28341624202.pdfIn PDF document text
    • https://tabanaxil.weebly.com/uploads/1/3/1/8/131857193/c92571767427.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/pezosisuzakuzo_wunarudora.pdfIn PDF document text
    • http://gatorama.site/kolijaxipugudojn5fuc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/pevojifelunukofi.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/51352525470.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/rurenibufetudo.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/consuming_fire_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/46026211169.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/tiluxodofukazusakatevu.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/kuwejukuzemajeduvejozav.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/73301517468.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/break_even_point_formel_deckungsbeitrag.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 5416 bytes
SHA-256: c6e25f3735a264b4c0bf6cc96453e1de59d647ec71dc28e1c16f2228ddaa7958
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 11348 bytes
SHA-256: 8e02efd647bce7393a3d99a94d5b084dd864784c1e0de2c328259452217f6932

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