Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b94b136da16a34…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 04:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa1d7b58614e99549d605334555b4f0c SHA-1: b81292b0d6b471b7d7fc3f94305d97f72e30ba02 SHA-256: 32b94b136da16a349ed159a058e0d56873e0f330599f0dbb9d73d076a533d50e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL suggests a lure related to 'android auto head unit' searches, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=best+cheap+android+auto+head+unit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460231/normal_6049dd4debf49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_60345001e1347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_6056ab41306e9.pdfIn PDF document text
    • http://mydenverneighborhoods.com/tabla_peridica_interactiva_para_rellenar_puzzleuvemg.pdfIn PDF document text
    • http://eurosett.net/how_to_setup_a_canon_wireless_printer_pixma_ts3122tkwhd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fdb19662818d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_6055c35f45c04.pdfIn PDF document text
    • http://stroymarketmetal.ru/why_did_they_kill_carlo_in_the_godfatheru9bga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_603f96071a22b.pdfIn PDF document text
    • http://okstore.info/3030433379124tyg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_604af3c8ed65d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529024/normal_601dbc1542e21.pdfIn PDF document text
    • http://hh666o.site/how_to_fix_stabilitrak_on_chevy_camarovgxnn.pdfIn PDF document text
    • http://tramlaweq.online/medical_surgical_nursing_question_bankahc3t.pdfIn PDF document text
    • http://premial.su/snark_tuner_battery_liferv5jk.pdfIn PDF document text
    • https://kowedasik.weebly.com/uploads/1/3/1/4/131438617/zikumuwila-xumefo.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/8156072.pdfIn PDF document text
    • http://sunshop.pro/28702766403k4pn8.pdfIn PDF document text
    • https://sisexalixigana.weebly.com/uploads/1/3/5/3/135323773/b852bb3469d.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_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 5176 bytes
SHA-256: ece32f88210d8caa906fa6cbbbf4bf0f4ff0368b0de2026df65eafe958169531
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10100 bytes
SHA-256: 7e549d9c1684b69068bd9360b76e836582b685f8b979a4c5c2c61e8bfdb46bd9

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