Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c9da3a3dd447a5…

MALICIOUS

PDF

67.1 KB Created: 2021-02-10 02:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 72cfcdcf43dd025b2a4ed770a5f7e732 SHA-1: 5fdfa67413e668d82772204b93ff668890dd0ead SHA-256: 54c9da3a3dd447a5bed4619d41199d6b3a219afce07f915209bbad16f937f7aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://jacksth.ru/123?utm_term=celtic+knot+wood+moulding PDF link annotation
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/1335683.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/laxumogojodoximijigi.pdfIn PDF document text
    • https://lurufakezudaka.weebly.com/uploads/1/3/4/8/134884294/wizibulikasorow-gebigetufagemis-vefuxatowu-zinabibuz.pdfIn PDF document text
    • https://cdn.sqhk.co/bipadifudame/jig5Uif/24_hour_food_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_6018ecda68245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_60132df9093c1.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/megokuvotalasisebege.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/f5afbd6f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5ff7b578a71e3.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/bgdThct/45707951835.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/5cYzNVl/vikings_clans_ragnar_saga_of_clash_warhammer.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/TZigXlp/56120492444.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/fotepopunaj/commandos_pc_game_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/25435256246.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/72522365012.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/warigow.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_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 4836 bytes
SHA-256: 5b50ba214505603a98ae3e1159969c3ec5d9771264cf819050b6ed2ee5561133
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10584 bytes
SHA-256: 63469e15b344a68be8c57dac526b2edbc592fdd937d1b1a0aa39fe6f21ea3df8

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