Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3dd19fd4e0ecc3…

MALICIOUS

PDF

71.9 KB Created: 2021-03-31 13:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e422066e8ecad1d1d040c867570f2212 SHA-1: 0d5885154b79ed8d8497eed9dcb3a77bed3777de SHA-256: df3dd19fd4e0ecc38e7209a37e513d22225c706f1f4ec415e2b8d7e7db0af6b9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to academic materials, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/123?utm_term=biology+101+lab+manual+2nd+edition PDF link annotation
    • https://cdn.sqhk.co/kawiwitifa/ahcgjjh/flip_the_gun_hack_download.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/mapikasen.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/B5lgfji/zukitogesalusajesuxiwup.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/hfOGkig/26913829772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fec46b31ddc1.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/ifZO8hF/62018729521.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/aptitude_questions_for_wipro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_5ffa9134808aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fce5d52e55ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_60405ec53a1a6.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://diwevobu.rf.gd/55542287322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca336b3-f2c5-42fd-bf13-f90a33edda0c/will_home_warranty_replace_ac_unit.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/sijuwobinefemuforegewebot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ac2315-0f38-4655-98d3-52e2d8b73856/adobe_premiere_pro_2020_precio.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/world_important_days_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e3342b-ca63-4c4f-88eb-4c3f71605638/is_paternity_leave_required.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/doble_exposicion_beatriz_colomina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977e58a7-bc6f-4c9b-90a9-6fa770b8a4fb/69536422205.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/air_manager_free.pdfIn PDF document text
    • http://xifidoragu.rf.gd/95061632379.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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 5368 bytes
SHA-256: dcb98568bc790da19a1b1db80d37bd06da3c5f0a646cc108a00828d96da40445
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 11008 bytes
SHA-256: 3a86fc920027cd0452d19d17b6c259cb43301f2c7d3d544de8479bb3b0c49e1a
font_02_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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