Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea83a1e3ead1570…

MALICIOUS

PDF

71.0 KB Created: 2021-02-19 19:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b18da24ff3872ded366dc8dc684e2e17 SHA-1: ccd0b7859a708b970fca76b9b941d284b0d42721 SHA-256: 9ea83a1e3ead15705808cb009305a22ea69f5d16f2290399750935691a9efa7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The document's content, though heavily obfuscated, appears to be a lure related to unit conversion. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=convertir+de+pulgadas+a+cms PDF link annotation
    • https://cdn.sqhk.co/miviluwulux/gigdife/kpop_story_idol_manager_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fef3f50c3796.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuvobu/5jeYijV/game_box_console_cheap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fcc905ea1e77.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/ccf42df6996f416.pdfIn PDF document text
    • https://cdn.sqhk.co/zaborofisi/8hbC5ha/smoothie_maker_amazon.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/1063064.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/danegibonek_wukarefisanolew.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/d4cc435466ca2f9.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/qgheJeK/24897947258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_5fe61c9e72635.pdfIn PDF document text
    • https://daluruxixofofi.weebly.com/uploads/1/3/1/3/131398394/89a985e5c1e2b9.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/h2hcJF0/magic_rampage_wiki.pdfIn PDF document text
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/871152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_60192f9607c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5fdcbd342c2f3.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/KaigeWB/detafogipukux.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/cgcigIR/jewovikijo.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/NhiSpic/accurate_speedometer_digital_hud_gps_speedometer.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 5356 bytes
SHA-256: b5e88aaf61066a539bb27b11c2e69ceb110f618e448b5b7621932ac25be88a10
font_01_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 11244 bytes
SHA-256: 705369433a03191a63a8fee5b58bd75022caf84c7d52470778210e8303d6c18f

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