Malicious PDF — malware analysis report

Static analysis result for SHA-256 801bffca77e51696…

MALICIOUS

PDF

81.5 KB Created: 2021-02-13 02:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 943d6765eaab4963d8ed92923466fef0 SHA-1: 91dbfa34faff8db0342b1646eaf3ac88a4562580 SHA-256: 801bffca77e51696f773d5c7ecc80f7f71f438c44f5d28474a6a2e6575daf346
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest a mechanism for downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/wix?keyword=estar+with+prepositions+capitulo+5+answers PDF link annotation
    • https://cdn.sqhk.co/gegenosuzun/OjjVjej/44469661000.pdfIn PDF document text
    • http://nakanilo.club/dejusavizedixulivitvrj2k.pdfIn PDF document text
    • https://cdn.sqhk.co/mekoposa/jdhaxia/jarudof.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/3799890.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/GWjcirI/39073557341.pdfIn PDF document text
    • http://storedubai.shop/14726056231vy3ji.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/cwCiShi/56354498188.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/jetafegix.pdfIn PDF document text
    • https://ponivigaxuk.weebly.com/uploads/1/3/5/3/135313456/639c77243855d9.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/balawuveruxod_narolumux.pdfIn PDF document text
    • http://okclub.org/company_logo_template_freethspq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 5192 bytes
SHA-256: 1e17c771297c44ce6c6c455ad921a83dbe403b66bc4495c55fc67a248164ad34
font_01_sfnt_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 10228 bytes
SHA-256: 2824edc8365c61b68aa0fe683d48b01b0aefde8a4a42ef9219ba6dacf552ce0b

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