Malicious PDF — malware analysis report

Static analysis result for SHA-256 310931e6438615b9…

MALICIOUS

PDF

64.3 KB Created: 2020-12-06 09:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 736b689184a7490311d0df9e18b6c0b6 SHA-1: 4f9944897f54020b8368fc582a371b8e945ef058 SHA-256: 310931e6438615b9a67811fa0ecbf75d750913679d9c53a7fc5ae9c92fe6df50
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic firings related to link farms 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://trafffe.ru/wb?keyword=rental%20confirmation%20letter%20template PDF link annotation
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/7579731.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/xemag.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/zivimirijuli_ruxotamozo_xiponagofuz_zepebireg.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/af32ee0b.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/sotubatuje-lesade-jowanilovivarag-tubepavarodoror.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/motunet.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/b40e8d81-4954-4896-8163-2d35a4ff7738/17764723906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed52f8fd-5cb6-45af-b574-b2884b99c334/wiwatofavisazev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e17a35-ea5b-42ad-8f9d-f1ffdf066750/zejaliv.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/82793549315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6878fa24-9d4e-4f64-a8e6-4523212e3174/rirofomarenut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef832e4f-a74c-47d3-8734-c1896d62ef13/samurai_painting_famous.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/inverse_binding_adapter_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8551a330-abf7-4d0e-b2fc-015bea7af224/500_kw_rC3BCzgar_tC3BCrbini_fiyatlarC4B1.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_off0000c26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26C 4988 bytes
SHA-256: 365f3c9076bde353a84b8e0ea30318b8405613296bcbf5b3f19597387571c824
font_01_sfnt_off0000d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 9652 bytes
SHA-256: 985b778996f60b8d7bc05e0a440da314cf52e5fe4c44613b7608dda0d29a72dc

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