Malicious PDF — malware analysis report

Static analysis result for SHA-256 618973ba790225b8…

MALICIOUS

PDF

69.2 KB Created: 2021-02-12 11:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 144768725a3d25c094fa5ca6a110441e SHA-1: 6970bd5193969cc441e12ecdcae96d72ef19b312 SHA-256: 618973ba790225b839aeac3457881041b31f4b3c4b9fd55ec24470265a03b996
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The presence of a URL related to 'google add ons store' indicates a potential lure. ClamAV and ML heuristics confirm the malicious nature, likely related to phishing or malware distribution.

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://druttle.ru/wix?keyword=google+add+ons+store PDF link annotation
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/d1b085f3f7fee7.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/jjdiaib/dekozejolosedetazazuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/tigafita/hggjNse/linatixirikejukexokerer.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/fpiicTB/cinema_4d_animal_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5fdd2903a2031.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/Uhaibu4/smoothie_mixer_wmf_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/gQXhfgg/namuraxisanekigiw.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/luvefa-xikono-jaridemomebonu-ruposimexo.pdfIn PDF document text
    • https://mokazeke.weebly.com/uploads/1/3/1/3/131384082/8479603.pdfIn PDF document text
    • https://pebizenif.weebly.com/uploads/1/3/0/8/130874023/fa40346fe17.pdfIn PDF document text
    • https://cdn.sqhk.co/pijuvedozuw/hagggh6/weed_growing_game_online.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/wezukep/7725301905.pdfIn PDF document text
    • http://jagofebasej.epizy.com/10264648556.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/hoperf_rfm12b_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/best_guided_tours_of_new_zealand.pdfIn PDF document text
    • http://beruleruz.rf.gd/great_gatsby_reading_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/42712697113.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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 5024 bytes
SHA-256: 0d4233d707e054a5223d7663cf853595cf46fbc6a943566518e4b0eb26cf50c2
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 9968 bytes
SHA-256: f2787dad8aa1f61763b05b0e5bec8a71eecd91d14dacffcf7e8591c267d81dfc

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