Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbd5df9ccbc6761…

MALICIOUS

PDF

76.0 KB Created: 2021-02-28 06:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c66ec4b5fddf935a4d68c06648f18fc3 SHA-1: dcbfe296c22d52a171645878e2fb7fd5419b3ea2 SHA-256: 6cbd5df9ccbc67616770c7e6233d67dcca383c74fa5789952029571a688f5ca1
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=in+general+where+do+earthquakes+and+volcanoes+occur PDF link annotation
    • https://cdn.sqhk.co/tuseliwi/WR9jqgM/birthday_cake_ideas_for_your_best_friend.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/hhcOhxc/surasidebujosonelesopafab.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/hjFNI9g/nebelisadivuvaximeg.pdfIn PDF document text
    • http://wuxakex.iblogger.org/naxax.pdfIn PDF document text
    • https://xinozujo.weebly.com/uploads/1/3/0/8/130874257/58bfc3997aae8d.pdfIn PDF document text
    • https://cdn.sqhk.co/muvenetu/3ojbqQO/89999393421.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/iOJihjj/43467363258.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/blj8ngj/98529198134.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/ripowemewe.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/ngdVhjn/hexagon_area_formula.pdfIn PDF document text
    • http://gajozemexip.22web.org/boney_m_christmas_album_rar.pdfIn PDF document text
    • http://woradegasuma.iblogger.org/chain_rule_examples_with_solutions.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/murudute/37975519293.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/kiruxoji.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/pajona.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/yapsal_antropoloji.pdfIn PDF document text
    • http://fefomuk.epizy.com/las_enterobacterias_son_coliformes.pdfIn PDF document text
    • http://firabano.epizy.com/listening_reading_answer_sheet_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/attack_on_titan_season_4_manga_volume_1.pdfIn PDF document text
    • https://medlineplus.gov/earthquakes.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_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 5480 bytes
SHA-256: 533a9f7603b7fcdd3a2f7b836d7661c3629f6f3ef1ba28926117331a14f04926
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 10240 bytes
SHA-256: ba7d25175b9292ff2926aaf790721a4ec368a2f1e657fe6adc9715200f3896bd

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