Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bbf6a8d21eb645…

MALICIOUS

PDF

79.4 KB Created: 2021-04-15 10:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74770ea0b1114efa43c78c61b0d0a89d SHA-1: a8298d55c6613b109169c82c1afc1b2527638314 SHA-256: 50bbf6a8d21eb645c318e6849ce4b3a3dbbd47f5612f8726ca5816c6bfa0123b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=evh+5150+iii+100w+vs+50w PDF link annotation
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/3268481.pdfIn PDF document text
    • http://fortuneo-enligne.com/cabin_fever_2_imdb_parents_guide94inq.pdfIn PDF document text
    • http://site-shop.xyz/disneyland_paris_fun_map_2019rtwnh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_603e953bb8f55.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/mezatix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_6019fd5875b63.pdfIn PDF document text
    • http://lorem.space/black_and_decker_lst136_reviewwy11z.pdfIn PDF document text
    • http://prizinsta24.space/dusorirexotifijokerejotav45ns.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/how_much_does_a_certified_medical_assistant_get_paid9vvb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_60611b3bca952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_603660f92f0c2.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/tozufigadox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_60212c6692137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fc8749b8a968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_60379cfda9aec.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/vebonalim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_6020036d24da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fd1387560885.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/b6bdd2642e4.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/gotenukevepunin/25105564534.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/wepatokibubonepid.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/size_difference_between_samsung_s9_and_s20.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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 4860 bytes
SHA-256: e500e2e6d4c4bce79f6aab4d616cbfd6ce58db47bfa6bdb2e3e870809ae9dc37
font_01_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 11552 bytes
SHA-256: f154b36cc8e803b002dc20200b5a12a83fed814d704d15d18ee25b295764a8bc