Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4422064af28b71…

MALICIOUS

PDF

81.4 KB Created: 2021-06-09 21:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 17bab6005405989a57ce31542b87ae43 SHA-1: ea6e617d43fb3161f0771ddfac479bf73d09975f SHA-256: bc4422064af28b714730358f0ff9803cf1eb8de38b4de877ab59eebf8d653f64
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the document's structure point towards a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://gimoguvi.ru/123?utm_term=representative+payee+report+form+ssa-+6232 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417306/normal_60523be3ba7a9.pdfIn PDF document text
    • https://wigowaziralo.weebly.com/uploads/1/3/4/4/134498628/2116989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_60bc5a8a329d1.pdfIn PDF document text
    • https://rofipufexorijol.weebly.com/uploads/1/3/4/6/134656377/jaxatabo-rupufalisowup.pdfIn PDF document text
    • https://mesovozilepako.weebly.com/uploads/1/3/4/5/134588792/6888616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_60bfec3131c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_6048ebfd6d2eb.pdfIn PDF document text
    • https://tonibefep.weebly.com/uploads/1/3/4/5/134585532/nawudodumisezujik.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/ec95a287060b.pdfIn PDF document text
    • https://vazigawexike.weebly.com/uploads/1/3/1/6/131606690/c7eb0ca998df322.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/bageralivopadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5ffcdb8f594b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_603c5471cc54e.pdfIn PDF document text
    • https://mefopati.weebly.com/uploads/1/3/4/8/134866381/559f66833.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/xigipilasut.pdfIn PDF document text
    • https://kebakiwaranug.weebly.com/uploads/1/3/4/3/134317860/xufamevoxej.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/f202a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601dff46314a6.pdfIn PDF document text
    • https://fivalukovegobag.weebly.com/uploads/1/3/4/6/134693255/87d9d07dbdb144d.pdfIn PDF document text
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/2334ecd5ae3abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_6066c30c757ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_605a0cec6368a.pdfIn PDF document text
    • https://wotixefutakit.weebly.com/uploads/1/3/2/8/132815753/kilemukoxag-selomedomevobif-zifalagavisanuz.pdfIn PDF document text
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/sesoko.pdfIn PDF document text
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/wadoluseje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fe63131beaf2.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
    • 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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 5456 bytes
SHA-256: 66a3544be8c563d1a96caada05ab00770df8320678fac998ddc67ba6a0451b27
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10592 bytes
SHA-256: 7994ae3062860aca8a476faef64e55c8484b85aaedb6d3780b034c451cec9709
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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