Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0adbf7737d81bb…

MALICIOUS

PDF

66.8 KB Created: 2021-06-04 05:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c1127906145fa812d61ee442497c656 SHA-1: 840182fe5c4bf115b3b216db5d1f9312e71b93ec SHA-256: cf0adbf7737d81bbd118bafe2683dc21ad36f61987f7ac2d28b4938a80e1fc24
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://wastran.ru/pbw?utm_term=gta+5+money+generator+without+human+verification+or+survey+2020 PDF link annotation
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/lumudakotivagaxod.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/1125502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5fc89312a0a2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_6025069249b63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcc168ea2b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_6047e84570e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5fd6c5a52cd28.pdfIn PDF document text
    • https://lenusasifelodu.weebly.com/uploads/1/3/4/3/134350773/3cbcfcf8afbce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_60370198ee733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421627/normal_5ffcaa78944f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_60125cf0baee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_602b833126736.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/vebapinelerenajebipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_601dd8fdcf270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_60207a4eb95f0.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/5517428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_602ecc176417e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450256/normal_60b04f154b83e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_60066e5f6e106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_6007fceb6dabc.pdfIn PDF document text
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/8853258.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_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 5948 bytes
SHA-256: 6f9a9bf97c622f82b141a32c9c38f2c7f2679a5eeb3971ac281fe001e2a02724
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 9704 bytes
SHA-256: 611338fabacaaf9f916735d44ea355ea1d8ac31dc6fe9ef571615f15beff56c7