Malicious PDF — malware analysis report

Static analysis result for SHA-256 71af9588df1a65e4…

MALICIOUS

PDF

78.5 KB Created: 2021-04-16 22:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 309a7714bef50c81f70d168ad7a810e0 SHA-1: 6bd067db61b040265d72996afb6ccdbf228ab74c SHA-256: 71af9588df1a65e4e0b0fed7ba069d70bfb55a24d2a74f288bfad6566d779e03
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to lure users to potentially malicious content, likely through a phishing or SEO manipulation tactic.

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://lozipotod.ru/strik?utm_term=sas+ods+rtf+section+break PDF link annotation
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/folepopupijap_jugapedox_mexujow_jekosoxokum.pdfIn PDF document text
    • https://cdn.sqhk.co/sufipuxifemo/ghbigid/run_endless_prince_in_jungle_game_download.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/9292513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_6030519581222.pdfIn PDF document text
    • https://cdn.sqhk.co/dudavizi/jfZicQ6/epic_seven_fodder_leveling_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_600ddcddc0d4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419425/normal_5ff8f356b9743.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/c7y6gj0/32412072647.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/persuasive_writing_samples_grade_5.pdfIn PDF document text
    • https://virekapowop.weebly.com/uploads/1/3/4/0/134013047/rotagaxolulojopob.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/db9948e3f1.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/bbptjhH/battle_islands_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/hdngiii/ultimate_bendy_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/9573Xii/dino_battle_simulator_war_survival_game_2019_download.pdfIn PDF document text
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/fawowelojasizaliwa.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/xulikamul/zagagipusofasidika.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/sugek.pdfIn PDF document text
    • http://todiwefexoneb.atwebpages.com/mobotezubaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/fire_risk_assessment_example.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/rexixevol.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_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 5292 bytes
SHA-256: 419187f2d11209d6e3824047d1ade4e5a9b27e5c3e78fb7afd0c8caa60f9a74f
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 11540 bytes
SHA-256: 9d6a068a78cefd44126b4856f048042289390805398d478414ebed4acc43dafe

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