Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4d487cd4011956…

MALICIOUS

PDF

79.9 KB Created: 2021-05-19 22:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7ec3aec0a9175276660f0f12a60df5b SHA-1: 7b6af2793785e8f8ae0f50624840301cdff37157 SHA-256: ac4d487cd40119562edd3afac51866a476f95b224a662821ab975e8485213881
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=teoria+del+etiquetamiento+social+pdf
    • https://baboromet.weebly.com/uploads/1/3/1/6/131606353/gafesasebekaveneg.pdf
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60410d45d456f.pdf
    • https://bezixaror.weebly.com/uploads/1/3/0/7/130739980/f78b552653241.pdf
    • https://cdn-cms.f-static.net/uploads/4380211/normal_603717c8a47e1.pdf
    • https://cdn-cms.f-static.net/uploads/4446029/normal_601fde743c8ac.pdf
    • https://dagazafija.weebly.com/uploads/1/3/1/4/131484603/pagosuron.pdf
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fe3bdcc4869f.pdf
    • https://static.s123-cdn-static.com/uploads/4480598/normal_60077730be5f4.pdf
    • https://cdn-cms.f-static.net/uploads/4489979/normal_6057076d30c0f.pdf
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/3541126.pdf
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6024073d63325.pdf
    • https://cdn-cms.f-static.net/uploads/4370273/normal_60543c80dc335.pdf
    • https://cdn-cms.f-static.net/uploads/4477649/normal_6035a5b45a69e.pdf
    • https://kivomulugan.weebly.com/uploads/1/3/2/6/132695939/9116750.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0abe6d22-89ab-4e03-9628-92baecbe3e0f/what_is_the_difference_between_software_engineer_and_web_developer.pdf
    • https://uploads.strikinglycdn.com/files/da25d9f5-9b96-4c51-83bc-37e0e9835b13/panasonic_bread_machine_recipes_raisin_bread.pdf
    • https://s3.amazonaws.com/povodijirig/3389814148.pdf
    • https://uploads.strikinglycdn.com/files/b14994e0-cf8b-4275-a561-1c45a20dc88c/branches_of_philosophy_download.pdf
    • https://uploads.strikinglycdn.com/files/da5f731f-6066-470c-b0a0-64d24dc548d8/17969668681.pdf
    • https://uploads.strikinglycdn.com/files/9ec265fc-f29c-43a1-a4fd-d49300f5defe/5701301265.pdf
    • https://s3.amazonaws.com/tejuvonixag/84888861813.pdf
    • https://s3.amazonaws.com/nafoxuda/89493872658.pdf
    • https://uploads.strikinglycdn.com/files/f62cdfb8-f3da-4a5b-8bef-ff907bdee016/what_is_manual_page_break_in_writer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f884.bin
e52fda2ded9640c445558d4f0c8c27c2b9ef5825370e8051cbe0018d3f2f29c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 5376 bytes
font_01_sfnt_off00010ab4.bin
71c1232e1c2768070572f9ffbdaf9ed6a4a75715b5dde69b30f422baf9848433
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 11592 bytes