Malicious PDF — malware analysis report

Static analysis result for SHA-256 7839d889b30d8381…

MALICIOUS

PDF

73.0 KB Created: 2021-02-11 01:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6816059f26d84e1f67630543cf458d68 SHA-1: aa05c2fbecf756f560f48b806ab7b4cfbbcc9a69 SHA-256: 7839d889b30d8381f3de5f0c72001c1b6e27b5311b5de1face554186b6e0b6ce
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish for information. The document body, though heavily obfuscated, contains text related to 'Costco cake order form', indicating a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV and ML detections, strongly indicates malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=costco+cake+order+form+usa PDF link annotation
    • https://zefokivovemajo.weebly.com/uploads/1/3/0/8/130874141/4742885.pdfIn PDF document text
    • https://dovasivenumi.weebly.com/uploads/1/3/5/9/135965427/3204782.pdfIn PDF document text
    • https://xisilejawot.weebly.com/uploads/1/3/4/0/134016881/xagikozefetuvidux.pdfIn PDF document text
    • https://ziwedalonom.weebly.com/uploads/1/3/5/3/135325023/xubaxulaxiserinex.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/rowenoxidojizup.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/gokotaturola-jumefanibife.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/sodejifefuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwuxuk.epizy.com/actuadores_electricos_smc.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/weraba.pdfIn PDF document text
    • http://sexikiti.epizy.com/atoms_and_molecules_ncert.pdfIn PDF document text
    • http://vulewibof.epizy.com/business_information_technology_jobs_in_swaziland.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/63113989904.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/fikiwosexufof.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/tamilrockers_tamil_movies_2018.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

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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 5104 bytes
SHA-256: ea3d14c87ae7688ef56b91d5e38248b634548dcf348de22d4c0982437b460379
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10708 bytes
SHA-256: 8e0ea97ce874347997538250ad3847f2bb433c10a339bc8440df71eaf2836712

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