Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf2f7482c9917c4…

MALICIOUS

PDF

88.7 KB Created: 2021-03-15 17:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86ab4af68545cbb7bc4d891c2feb5d1a SHA-1: 492e38219a5fb3d13a006ad2cadcf35815ed5914 SHA-256: 6bf2f7482c9917c44904b10defe5bf4ce753eb3557fe9235fce743b9044b054a
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one to 'pelibifir.ru', suggests an attempt to direct users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/award?keyword=dreamweaver+cs6+step+by+step+tutorial+pdf
    • https://cdn.sqhk.co/retagigimusa/jdictjz/69134680078.pdf
    • https://cdn.sqhk.co/zadoweferoxe/w7thiib/35075610319.pdf
    • https://cdn.sqhk.co/wodaximewule/idKFKbk/leather_jacket_mens_motorcycle.pdf
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/folewe.pdf
    • https://cdn.sqhk.co/tekemozuj/nhf6ceu/10_random_facts_you_didn_t_know.pdf
    • http://tuzazigigub.iblogger.org/66712837630.pdf
    • https://cdn.sqhk.co/zibepidok/icgiLvq/pc_games_apk_for_android_free_download.pdf
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/vamor.pdf
    • https://cdn.sqhk.co/mapetidul/ieYidjj/12321372814.pdf
    • https://cdn.sqhk.co/figesuweno/hdCShaw/i_love_hue_too_solutions_authority.pdf
    • https://cdn.sqhk.co/goberirud/bhfibig/wimokoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eb064768-6450-46d6-b0aa-65401f584e39/what_does_selah_mean_in_the_bible.pdf
    • http://mukagodikuve.rf.gd/zamokedirapalinizev.pdf
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_ac043018d7ab467d8aabba1099e7b4b2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f7150cc-4a8f-432c-a5ba-cb64d475aeb8/a_midsummer_nights_dream_script.pdf
    • https://uploads.strikinglycdn.com/files/d7ff4528-efc3-49d9-8402-8d6f52d3fc32/troy_bilt_super_bronco_riding_mower.pdf
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_74a5e4e3f621440186f984a95efa4db2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d0b5dc8-f289-4d37-ba71-20ddd7ccd978/what_are_the_limitations_of_rational_choice_theory.pdf
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_cdeb54f9dc5842fbab069ea119b034bf.pdf?index=true
    • http://kiwusumusi.rf.gd/14218709876.pdf
    • http://favekagopu.epizy.com/belize_passport_application_form_for_minors_4b.pdf
    • http://kagabefusexem.epizy.com/sudepixuvivosopopabowob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b32.bin
a80f13ad3a426b0550538158fc5eda9bdab2fb8f5df33d395daedeedf1aed66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 5848 bytes
font_01_sfnt_off00012f1f.bin
33a55dd6f5e9ec21349041d27b8732bb0c09dcb4303419c40c551c8565413bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 11100 bytes

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