Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cf46785c345e8a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-01 20:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 75cae6b7b358abf4369c19e17402b7c5 SHA-1: b0cf17a0171455e3675e3d3ff42f3a5805c94db2 SHA-256: 10cf46785c345e8aada0b7366be33e40ff5a474f2311e06bd7dc17ea44d50865
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 or trojan variant. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to host further malicious content or redirect to phishing sites. The document body, though heavily obfuscated, suggests a lure related to identifying trees, which is likely a pretext for the malicious links.

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 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://bologen.ru/123?utm_term=how+to+identify+an+ash+tree+without+leaves PDF link annotation
    • http://itsamorem.com/55584334039zzza6.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/4850748.pdfIn PDF document text
    • https://vapurexox.weebly.com/uploads/1/3/4/8/134865026/xosunixajumafiv_pababak_felekezek.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/koxifiwev.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/ribegiwovenuloteg.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/why_is_my_galaxy_s8_not_connecting_to_wifi.pdfIn PDF document text
    • http://femabofagexabiv.iblogger.org/wamuvejesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_60243c22b21ea.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/82064665056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/cat_jump_starter_cj3000_battery_replacement.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/how_to_improve_lyrical_dance.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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 5212 bytes
SHA-256: 9b0dc323d51591fc7bdf8012739e032658044a98d05c611c68a7e855bc93350e
font_01_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 10592 bytes
SHA-256: d63b8e938a935f21c60eb6a75e73d2f8560479952e222a944db40c0be65647a5

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