Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffefda738b6635d…

MALICIOUS

PDF

77.4 KB Created: 2021-01-29 11:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 458590f6f5a0877e50738c659180d037 SHA-1: 0552d8959f5d09b5547ef5158ff1b3cdd287f783 SHA-256: 8ffefda738b6635d694733fbb79bbfdc2b229f9dd3fbe817341232580ba7f734
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, indicating a link farm or redirection strategy. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to potentially malicious external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/aws?utm_term=adventures+of+aladdin+2019 PDF link annotation
    • https://cdn.sqhk.co/pesuxitum/sI3iaf2/that_s_life_mac_miller_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490122/normal_5fc911050bc1a.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/rgchdS8/elifoot_2020_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/1Pj8jPy/nypd_drove_car_into_protesters.pdfIn PDF document text
    • https://ramosekizopozov.weebly.com/uploads/1/3/0/7/130740175/wuvumovak-toganezukugez.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/jejegewalifex.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/Luoji86/party_city_promo_code_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/denugesugumu/hahdZja/superhero_skins_for_roblox_robux.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/b79iaJe/cross_linking_polymers_properties.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taguramol.rf.gd/pyari_behna_video_song.pdfIn PDF document text
    • http://nosajesu.rf.gd/new_games_2019_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/factory_five_mk4_build_manual.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_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 5432 bytes
SHA-256: 1b6e142c7ece6ec601a2cbc40a8dcd057d811715926c0e8880f803c53a85e5ee
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 11224 bytes
SHA-256: c652f9467b8f80847ced97c285344c717033e63b157d5090f0cd5bc0e8f0dca2

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