Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62a6aed7fc085fd…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 11:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e80cb32339161515d5bc2dfa3c5cc27 SHA-1: 8970e18051911e739dd1fd2cc4baca70d00b7d88 SHA-256: d62a6aed7fc085fd8436a07d445166e1bd6d382eed442c259bb1e993b3ed16d9
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external links and the 'link farm' heuristic point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=evcon+air+conditioner+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443815/normal_603621c9c5959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_601b30c4c4b8a.pdfIn PDF document text
    • http://goshop32.site/sefapaf24nt9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6035dd12b35c5.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/15945546355.pdfIn PDF document text
    • http://wowit.pro/icd_10_code_for_excessive_daytime_somnolence8k6ik.pdfIn PDF document text
    • http://voyazh-shina.com/deep_fitted_sheets_king_size_matalaniik98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443804/normal_6004ebf61dfe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5ff29ceb1cd06.pdfIn PDF document text
    • https://cdn.sqhk.co/mudixeguda/j3jedjb/tobelumorise.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/fjjgdeu/xusafojijizomelixuratem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_60316691a6bf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_600db7a031533.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/wMC1Bgj/79198283207.pdfIn PDF document text
    • http://memisada.mygamesonline.org/vaxijujimapori.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/frRhidE/pueblo_horizons_federal_credit_union_online_banking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_60246b051b34f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 4876 bytes
SHA-256: 9d975f54f5427e37f3e93c48f889da4e781e3bedf9eb1f216acceb561182d179
font_01_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 10416 bytes
SHA-256: 1499de833971b86ee1622cb264b26d816e114a6a9c386c60ea2d172c70974631

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