Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1be8c7160d5a0e…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 01:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 34d17f5eb7ed3a4413415768280d23fa SHA-1: 2bfe97a1d9d37692480836d07461e03a8808b8ec SHA-256: 2b1be8c7160d5a0eafe11200fbb876b24eafb8c568f47a8e561f7669225b8c32
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The primary malicious URL identified is https://bologen.ru/award?keyword=ketogenic+diet+diabetes+pdf, which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure and URI patterns are indicative of a phishing or malware distribution lure.

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://bologen.ru/award?keyword=ketogenic+diet+diabetes+pdf PDF link annotation
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/mesop-mijipunuvumi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5fe14450800ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489850/normal_5fda0d579aa73.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/5398867.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/7332030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6067a5547a2f5.pdfIn PDF document text
    • http://cheeronthemove.store/husky_20_gallon_silent_air_compressor_reviewshck8d.pdfIn PDF document text
    • http://samoe-samaya.ru/folanexurakit0n95r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fd046ed8223d.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/6448770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5c409469-061d-43a9-8bf3-52da8e5561b6/sojiriju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a19c2d3-609a-4a04-a859-1edb3ea7dfb1/nijule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd00f7c8-900e-4fbc-af95-d041304b3c9c/diwudiniguvetitej.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/48372264229.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/why_does_my_thread_keep_bunching_up.pdfIn PDF document text
    • https://medlineplus.gov/diabeticdiet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 5092 bytes
SHA-256: 18b666ec39c30cacc92f0c5f81bf2f9f47902dd75b4a1b529cf48767e4a1c490
font_01_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 10520 bytes
SHA-256: 9feba2669921b596c0620f49e1661aec255e5d2f565584dc29c760a620ba53f4
font_02_sfnt_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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