Malicious PDF — malware analysis report

Static analysis result for SHA-256 35993bc32dd93a1f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 04:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 699e6052f4630f501b5664246a52bf58 SHA-1: 9cf379e4b6153c41e7fce4ace9186d8ef85e2421 SHA-256: 35993bc32dd93a1f4c2b885a13b6715a1cbd3261ea88cac9b9cd192195424c71
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 0.9991

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://leonvi.ru/strik?utm_term=how+to+prepare+domestic+inquiry+report PDF link annotation
    • https://woxolifufoku.weebly.com/uploads/1/3/4/2/134234665/dimofebifisag-letowobewuxer-zosekazozub-vomiwaxifu.pdfIn PDF document text
    • https://kojuvaneginumo.weebly.com/uploads/1/3/4/8/134890768/xuputolozox-bojoda-mekibuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_604f566367ad9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5ff4ed0b8a4a5.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/rafis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_5fd1040714aa2.pdfIn PDF document text
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/ponobufuloramor_jiwepol_dujon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fc80b0755d42.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/7613788.pdfIn PDF document text
    • https://gogiwujuduk.weebly.com/uploads/1/3/4/3/134352159/6012344.pdfIn PDF document text
    • https://magijomolalol.weebly.com/uploads/1/3/1/4/131437319/losido-popiji.pdfIn PDF document text
    • https://xikewipevugid.weebly.com/uploads/1/3/1/3/131383679/lokowawodubeki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416787/normal_5ffdfe6f943f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5ff6994936264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_605ac3bc04324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422133/normal_5fef82898a5c0.pdfIn PDF document text
    • https://leliwigozamik.weebly.com/uploads/1/3/0/7/130738568/jamoginuli_molekudokoxudod.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/wumategizatutomegok.pdfIn PDF document text
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/pejevozixuz_mutowelolob_bikiwaxugote.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/7753703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_60509c44e9426.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/papamijeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5041e4-350a-4403-8166-d2b6c148ae60/jvc_kd-r330_connect_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f902571-3068-4d6b-a309-53412503e2ad/how_to_open_maytag_front_load_washer.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 5468 bytes
SHA-256: bbb28274e55da5587fdb566d004009d950449b8f2c76902d2ac751ed9e3e53bc
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10572 bytes
SHA-256: c43debd61e3ba5d7e452b75a63b692d541e2691903628fe2c9b03cbc534ef350