Malicious PDF — malware analysis report

Static analysis result for SHA-256 370dfba7dcead1a9…

MALICIOUS

PDF

74.4 KB Created: 2021-06-01 09:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1d67c880702be489b4ee883562486154 SHA-1: a2d748a7bb0e0a8e739cee3d876f4efd2598e2a7 SHA-256: 370dfba7dcead1a9d3086a72a3e392e20390e9f108f28d7826aab368de0330ac
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains metadata related to 'wkhtmltopdf' and a book title, which is likely used as a lure to direct users to malicious or spam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=precalculus+mathematics+for+calculus+6th+edition PDF link annotation
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/daxegofixa-zitifewin.pdfIn PDF document text
    • https://kegefotog.weebly.com/uploads/1/3/1/3/131398129/misuwesiseru.pdfIn PDF document text
    • https://rosaguvedofim.weebly.com/uploads/1/3/4/3/134352906/saxadigujukixunab.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/dutemudomavitiz.pdfIn PDF document text
    • https://bizugejukuvav.weebly.com/uploads/1/3/4/3/134322279/rikaraxa_novafi.pdfIn PDF document text
    • https://dowabibagugodu.weebly.com/uploads/1/3/4/6/134697665/lozazazad_bejutigomoxal_fonaketatoni_vajisemavobowo.pdfIn PDF document text
    • https://rurirenaw.weebly.com/uploads/1/3/4/6/134652156/78d0476a43cf651.pdfIn PDF document text
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/dadagasipi.pdfIn PDF document text
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/8e1f7a87.pdfIn PDF document text
    • https://mapimodedafibo.weebly.com/uploads/1/3/4/7/134708703/xibajikekemo.pdfIn PDF document text
    • https://patelevikukel.weebly.com/uploads/1/3/4/6/134665122/d55619.pdfIn PDF document text
    • https://nimosawi.weebly.com/uploads/1/3/5/9/135982357/julixezufokade.pdfIn PDF document text
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/vijudipezopivav.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/09b14d77c.pdfIn PDF document text
    • https://miwomineferele.weebly.com/uploads/1/3/4/5/134514444/votazik_wuditamogurava_mogipelirumaz_fizumemoki.pdfIn PDF document text
    • https://nexonurobev.weebly.com/uploads/1/3/4/3/134371674/xefivuke.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/aaec455c-e608-4e9b-ae67-4996aeb9a4af/gazigeziwifiwasiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1a4e35-1143-45a5-afa6-570399560ffd/2675358403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3905f1a2-ba0c-4a2a-96e4-0398f2724331/mipikapar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd38c19-1286-4511-a62b-927492abcdc7/zonupug.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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 5416 bytes
SHA-256: f085b61292e7a9e7ade8e3ac2131ba9738b6ae9ce908287e10d01f9f9665b130
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10868 bytes
SHA-256: 7ae131f1ccc1a7a3b0af9638b9a836e93812a1a6351e659413a429f3bf8086fa