Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ba7bc944b9c8a2…

MALICIOUS

PDF

82.5 KB Created: 2021-03-29 17:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7ddae421f200150dc3147be622f9ba0f SHA-1: 87c7951088876c4401cce7576afbefe9d44a8eb3 SHA-256: a8ba7bc944b9c8a2be589d930ae22d2430b6a9db46f3da3575aba3db1377df9d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to drive traffic or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=indiana+plagiarism+test+answers+2019 PDF link annotation
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/lulinububofetoj_pegor.pdfIn PDF document text
    • http://bageker.iblogger.org/20591366532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488810/normal_604aea17567ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_6028988c03b63.pdfIn PDF document text
    • https://daxixerok.weebly.com/uploads/1/3/4/0/134000062/bae376b9d04a723.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/tejujukajewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_6055fdae63b00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcad8c7736d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fde8d11ba4f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_60489fed67c07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jevelel/maze_runner_audiobook_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/32032597085.pdfIn PDF document text
    • http://wefazor.epizy.com/22574170551.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_94704b70e68a498d96eb75fe1c9996d7.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_9e5f6b21e02149e4b3f55adb71af9cf1.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_0d3e9ef592a9478e8c7a388218ce32e2.pdf?index=trueIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_396095e5e0634a229fc586c6de9d28bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudowo/14594331480.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_869f2adfb5ac416b855fb878d38f479b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 5468 bytes
SHA-256: 4d7fc5d969ede0544462e4f810f68caa0be28ed4f263414730bb8ac0cd1d2af3
font_01_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 10244 bytes
SHA-256: e7535733c7b2b68e8f84a2ee7b27d9e1d30198c09df0bb663808b656f90181c5
font_02_sfnt_off00012e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361