Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa9334022545a1b…

MALICIOUS

PDF

73.7 KB Created: 2021-06-01 08:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3a57604678ad94793c8be8b65976b355 SHA-1: c68c49df52cc6f3767e3635888283e130499ead9 SHA-256: 7aa9334022545a1b027ec0f73280af2c25b0cf04b21ac5a89cf7535983d47024
186 Risk Score

Malware Insights

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

The PDF document employs a link farm strategy, embedding numerous URLs that likely lead to malicious content or further downloads, disguised as free movie downloads. Heuristics indicate a high volume of external links, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/pbw?utm_term=free+download+hollywood+hindi+dubbed+movies+3gp+mp4+hd+avi PDF link annotation
    • https://tofeligekejogen.weebly.com/uploads/1/3/4/8/134873344/9906257.pdfIn PDF document text
    • https://pozugawejebi.weebly.com/uploads/1/3/4/6/134610366/dac9d9539fa05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_6003b48a91b47.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/budevipeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_60159f22b5feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_603918b82ab07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fd39b7ba7134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_5fe9abcb0b672.pdfIn PDF document text
    • https://vopixovusaf.weebly.com/uploads/1/3/4/8/134883771/5650068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60122c823748b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_60130b8267298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5febb8cd2e888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5ff3f57302876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_602a2af687d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd16f7903b14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5fcd22f159489.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/goval-sadarozafanotos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fc77764e1d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_606ea5cd13f20.pdfIn PDF document text
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/rofopafed.pdfIn PDF document text
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/pojizemekogo-gelowigawizuvul-vitus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5ff0e89b62dcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5ff9ddd747227.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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 5972 bytes
SHA-256: c4a5e1ec8d33f585496623607776fe806dedcfabbc403a5ffee73ce5ff1398eb
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 10860 bytes
SHA-256: adb361ecad60a1709e196dbd646d728df302b2317d213b308969af07c4ed1015