Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bfaddc11c2c6e6…

MALICIOUS

PDF

80.9 KB Created: 2021-03-03 10:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 283bfbb7dfb8c92d2ab41d91e817df88 SHA-1: b9456d44c5091e7073d19af5776455d299a86a30 SHA-256: 53bfaddc11c2c6e61639ce28309121c0c95b73f85dccf9c76498fb0382cd55af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=first+alert+sc7010bv+3-pack PDF link annotation
    • http://vavawosasote.iblogger.org/danger_chamar_2_video_song.pdfIn PDF document text
    • https://rusezoxebob.weebly.com/uploads/1/3/4/3/134355184/lotubeti-balezi-mijazunobenum.pdfIn PDF document text
    • https://xumijarivibamow.weebly.com/uploads/1/3/5/3/135339210/3a95be395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_60350b459a300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_6018dcf4d927b.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/b1hdPgc/rare_blood_types_hh.pdfIn PDF document text
    • https://cdn.sqhk.co/xazewizol/o7iidrS/race_car_climb_apk_mod.pdfIn PDF document text
    • http://good-production16.site/68274107493dkx80.pdfIn PDF document text
    • https://nilidufudomalo.weebly.com/uploads/1/3/2/7/132740748/nesinuz-zamup-manebetefaba.pdfIn PDF document text
    • http://azakalaza3.xyz/403543257585gx9v.pdfIn PDF document text
    • https://xetofevona.weebly.com/uploads/1/3/1/3/131379012/d32681815.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/f5630af83.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
    • http://foxivowopejo.rf.gd/nancy_drew_season_1_dvd_amazon.pdfIn PDF document text
    • http://bimofufikogeti.epizy.com/emirates_palace_abu_dhabi_information.pdfIn PDF document text
    • http://golujaxi.epizy.com/rivatinekiranipilog.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5188 bytes
SHA-256: e0bf313638deff9fe49f90d3b114fc59a390a95c9462745439ba06b67a1d995b
font_02_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 12092 bytes
SHA-256: 4711cba6c8ae1e5bc4234a15517e1411dce0ec6aeb05ce56ddea23290ce41078
font_03_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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