Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfa21d152279808…

MALICIOUS

PDF

70.8 KB Created: 2021-02-22 15:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cbc3f307c47d5d683fa176dc53c81753 SHA-1: b713ead91b22c896af5418a17db8b32b003eadf3 SHA-256: 6dfa21d15227980828d8b3e02f1835f0e0f5ac40825953f9b22f259effb841e3
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary redirector URL is 'https://bologen.ru/strik?utm_term=how+can+you+describe+the+sound+of+the+wind', which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=how+can+you+describe+the+sound+of+the+wind PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5fe019fa68520.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/jbjfF2w/artillery_fungus_removal_car.pdfIn PDF document text
    • https://zelerajolames.weebly.com/uploads/1/3/0/7/130776056/fivezazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5ff6630d25113.pdfIn PDF document text
    • https://zefivevolexu.weebly.com/uploads/1/3/1/6/131637056/9012085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_601b557f657c9.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/ggXWfGj/tabirututaros.pdfIn PDF document text
    • http://bigchance.pw/my_calendar_events_for_singlesiwiny.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/MicghqA/dead_bunker_2_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5fdca6188b7ae.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://s3.amazonaws.com/fowikorejodi/18361414493.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/autocad_gratis_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/background_scenery_pictures_free.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/blitzball_mark_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 5252 bytes
SHA-256: e9fc7fde15eab12d9285a27df4346474b68aeb01355859bcbad2438065600e63
font_01_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10256 bytes
SHA-256: 26a108fb88a0414c73b63892ea16ef8ffb8777d39c95591e7c25d07e7449e219
font_02_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2