Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c4b085713c07a2…

MALICIOUS

PDF

67.9 KB Created: 2021-03-17 12:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cf73752c33c33a8e8a7420405986654d SHA-1: 59eeed14be4fa0fe01ec97a9d7007fa9ce3aa377 SHA-256: 26c4b085713c07a229a78d41756c922611c12e83efe2bf6cebc3acc99979d7ba
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable hosting and potentially malicious content, indicative of a phishing or content-luring scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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 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://jottigo.ru/award?keyword=new+headway+beginner+student+s+book+4th+pdf PDF link annotation
    • https://gijufonuvaxi.weebly.com/uploads/1/3/4/8/134874477/dimikutozizel_bojojigi_pazuv.pdfIn PDF document text
    • https://nixozetite.weebly.com/uploads/1/3/0/8/130873825/2089080.pdfIn PDF document text
    • http://ecoterritory.store/osrs_fishing_guide_ironmanhzto4.pdfIn PDF document text
    • http://mscgis.net/amazing_grace_my_chains_are_gone_chord_chartyafh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_601bde97698f3.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/5245705.pdfIn PDF document text
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/5305090.pdfIn PDF document text
    • http://songkfrk.site/41502988478m77wk.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/7492600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5ffb3181530e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6019f1f1e9a8a.pdfIn PDF document text
    • http://com-connexion.xyz/61747139966exqxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6019033b494c8.pdfIn PDF document text
    • http://fbcopyright-center.com/which_reconstruction_plan_was_the_most_effective_and_whyxq19k.pdfIn PDF document text
    • http://realnoe-obshenie.online/ragomufinubepusosolothydqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_604503cdc2fe6.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/fejatepudopito/universal_themes_in_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/ssh_secure_shell_gmu.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/xuwigigolelexaxosek.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/keurig_2._0_coffee_maker_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_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 5724 bytes
SHA-256: a272200c8a66dcbb6ec46f208724ef9fde3381f36eea2cefc5bcbee76910a473
font_01_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 11596 bytes
SHA-256: 7c1da079ca119dba2eb2c097147d4b63df3431d63003c856d98bfba69c1a14b4

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