Malicious PDF — malware analysis report

Static analysis result for SHA-256 1877ccd5ed5cfd83…

MALICIOUS

PDF

73.2 KB Created: 2021-03-21 08:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: afadd6975b7feec24f27e0a14fe93bfc SHA-1: d2377534c8a405519eec343f15e76bf8cb07edec SHA-256: 1877ccd5ed5cfd83f76a02488cbb0d1c9827c0c48fef3edac2d857479cda1fa5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic firings reveal a link farm strategy, with numerous embedded URLs pointing to various domains, including suspicious ones like golowaki.ru. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=cuddle+buddy+application+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381528/normal_6029f5199e339.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5fff5e0c2464c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_60250eff42581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_601b1a6b201b4.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/15341600376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_601454c16cefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_6056103575f48.pdfIn PDF document text
    • http://golomashvanna.xyz/learning_to_drive_a_car_step_by_steptvuz5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_602c7b5c9b8da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5ff9fd6101c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_604ef52ac0f31.pdfIn PDF document text
    • http://cancandance.org/2341226945rpwf6.pdfIn PDF document text
    • http://wow50.pro/how_to_write_a_practical_criticism_of_a_poem46hl0.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/acupuncture_treatment_points_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_5ff6c4fdcf268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_60548292f167f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485014/normal_6007b71b39dde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megofeginu.epizy.com/lord_of_the_flies_questions.pdfIn PDF document text
    • http://buziluzune.epizy.com/22754791714.pdfIn PDF document text
    • http://babematalal.epizy.com/kumaweloxipedaxitifak.pdfIn PDF document text
    • http://tipatanakuke.onlinewebshop.net/sesolatokufogeko.pdfIn PDF document text
    • http://zapofekeba.rf.gd/aeropostale_printable_application.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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 5020 bytes
SHA-256: 29e0de633612aab0c260802e88b4bf910931bd2183f4ffaafa99b75dcdcea6fe
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10704 bytes
SHA-256: 9c662a947939d0c02bec30d049da3be41700bdd6ed447f0c86358fd3f3b39f99

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