Malicious PDF — malware analysis report

Static analysis result for SHA-256 0379a4c0cd230dd3…

MALICIOUS

PDF

74.1 KB Created: 2021-02-22 16:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9757ec785aafc025eb4eba400a9b1310 SHA-1: a0477881669632c64a27f4ac4902c7668cda9036 SHA-256: 0379a4c0cd230dd3b24ebda237d6050c7500dcdf6533799ddf0513520d8f514c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains a large number of external links pointing to various domains, indicating it functions as a link farm. The primary URL observed is https://jottigo.ru/strik?utm_term=first+aid+merit+badge+worksheet+2017+answers, which likely serves as a redirector to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=first+aid+merit+badge+worksheet+2017+answers PDF link annotation
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/a73b49dc638df5f.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/gAWf6Kc/jogakuraxonideluwire.pdfIn PDF document text
    • https://luvidobanuneje.weebly.com/uploads/1/3/1/6/131606009/6aebc43d6f4ad99.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/8608175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_6011881a3f37b.pdfIn PDF document text
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/kosalamurolowifopug.pdfIn PDF document text
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/vemibe-lagezesen-ripez-jigaketu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fe2a99d181ec.pdfIn PDF document text
    • https://cdn.sqhk.co/govuzupikiwe/xibhfRj/24875068007.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/eDMzhbF/46500183121.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/3WNigOV/instagram_followers_and_likes_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/hw5FhaA/81563734147.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/ijw8MxC/rope_hero_vice_town_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411273/normal_5fef82f26951e.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/CX2uegg/costco_callaway_golf_clubs_left_handed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5fe687b6a64e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepowawon.rf.gd/employment_contract_malaysia.pdfIn PDF document text
    • http://rififaroneg.rf.gd/how_to_pair_anker_speaker_to_ipad.pdfIn PDF document text
    • http://mumeriladokovot.epizy.com/bearded_dragon_uk_care_sheet.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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 5864 bytes
SHA-256: 7d57f70d054f7bc1a6ed4291ec7ef7194f3a0743eea07439779bc7b7c47b25f2
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 10880 bytes
SHA-256: 71bfe61af7d8a7aad52c30cc66e189da4db4e3dedde8758d60c16957bcd1d02b

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