Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1e45f7bb2ca7f0…

MALICIOUS

PDF

76.1 KB Created: 2021-02-26 18:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 19d5772024c04695ba67199c832254c5 SHA-1: dc31484c2d33221b6bb174c76a5b475433c262ce SHA-256: 3f1e45f7bb2ca7f056f27331ff356ca6ab4d2740191fef7ee392940edf36143d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, many hosted on disposable domains, designed to redirect users to potentially harmful content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a business email compromise (BEC) pattern, aiming to trick users into changing payment details.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://botokaw.ru/strik?utm_term=machine+learning+using+logistic+regression+in+python+with+code PDF link annotation
    • https://cdn.sqhk.co/josipinu/Cha66ex/34319131568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447433/normal_6008ca951c39a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426966/normal_60029e3a91e1f.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/saxudilatotolejef.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/disagu.pdfIn PDF document text
    • https://safipeta.weebly.com/uploads/1/3/1/4/131408280/2c4dc9fff.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/gfBDsgg/the_wolf_of_snow_hollow_film_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403537/normal_5fde795c832ca.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/sagamisof.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/hcthi1d/word_remove_link_to_table_of_contents.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/pezebudivov.pdfIn PDF document text
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/3b4fa5c27d.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/af7d98f98.pdfIn PDF document text
    • https://zegijavevezedoj.weebly.com/uploads/1/3/4/3/134309525/lefeb-sarelotogese-raboxulezusimu-dituv.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/dudurat/50645384293.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/where_is_the_part_number_on_a_carburetor.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_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 5532 bytes
SHA-256: 791fab52f0843171c3c43405c8bfe135aca32c53a30b4c1325fbf2ef6dd7eaf1
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 10124 bytes
SHA-256: 3d87e28c37df6a58d014cd443401cb18bd078906a0682c1818a42fbe484b0f25

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