Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2ea715a6c45d45…

MALICIOUS

PDF

81.5 KB Created: 2021-06-11 06:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ea91be120b889a44e7afddda9a95d2fe SHA-1: 0f3aef6ae79183338bb69c122538827e6ddcf649 SHA-256: 2b2ea715a6c45d45c88ac3a6e3a5f76e31d689bd8eb8dab0a0825df682667119
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting and exhibiting characteristics of an SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary URL, 'https://catamma.ru/pbw?utm_term=free+employee+complaint+form', suggests a lure related to employee complaints, potentially to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/pbw?utm_term=free+employee+complaint+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500670/normal_5fdeb41abdccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5fd7a59796997.pdfIn PDF document text
    • https://voganesabif.weebly.com/uploads/1/3/1/1/131163538/zikob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_603c70b08ac7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8f0deb7e6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_604422204613c.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/67bf81cc3.pdfIn PDF document text
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/a83a31a6.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/513f88f63777.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/487f01097167e19.pdfIn PDF document text
    • https://surumisaw.weebly.com/uploads/1/3/4/7/134707241/nadekex.pdfIn PDF document text
    • https://vatanivirasuta.weebly.com/uploads/1/3/5/3/135387760/taziwaxipos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_60021b628b99b.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/sawejomarisapewow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_604a290496053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_604ade2e77bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_602925b2baf10.pdfIn PDF document text
    • https://zukujiwad.weebly.com/uploads/1/3/4/4/134491014/movefuma.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/c60b8a37-ed68-4ac5-9ae2-f56d45bf8d78/gy6_150cc_engine_horsepower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acbe173-3457-470f-a375-fa52f16fb99e/22920742853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a265165c-8085-4d7b-b0df-afc00b26ab81/86351407518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d904297-20b3-4678-a71f-4f909a9b19ff/vijimifusofefidusutesepew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61068e15-4bdf-48c3-aafa-87061056e402/19271745671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f52f433-beb0-441e-b868-c024926e8379/fonidijujoruzosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea0ea95-3d20-43e2-a764-d12feef81507/naxerigofobapavelam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60292bc6-43c1-47ea-a4d6-d4dbf143d556/67548554358.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_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 5040 bytes
SHA-256: 361dc21b2abb00bd14c137991450d9c55b7f64fde97f8a5318333ac68acfb23a
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10592 bytes
SHA-256: d1375d9d5d3b6d82484e9f9ee03ec6056fa517bfa9c493e209e0afa4fbc51005

Open this report in the interactive analyzer, or submit your own file for analysis.