Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba930906cdf3ce0…

MALICIOUS

PDF

74.4 KB Created: 2021-03-13 17:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de61834428c3f224b43fdd3beb876349 SHA-1: 2ea3c77a5b51dfddc473a0406bc0087935c6819e SHA-256: 8ba930906cdf3ce09dca9d3a5b1b420a930473c569e06d58ea94202b4575a337
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=verizon+ellipsis+jetpack+settings
    • https://rudiwiguxovo.weebly.com/uploads/1/3/5/3/135317070/4098657.pdf
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/325ed6c0548.pdf
    • https://sufivelogazawe.weebly.com/uploads/1/3/4/6/134600369/fokuvoxubelerobite.pdf
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/dde5335675b856.pdf
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/vakepapin.pdf
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/4dbaadc.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/firawut.pdf
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/fogamifexar.pdf
    • https://poburazaz.weebly.com/uploads/1/3/5/9/135993358/b21bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_1a063010820142caabcc9b0b338a30c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa8a8b4f-fb14-4d5c-8445-5bcf13f3ae22/84263738074.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_76dc77b3a08345f582a00e74d97ccb88.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_f1569e7f1591425bace33829a196b67f.pdf?index=true
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_28a291237c4a4de0a475789c15f52d5d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9875070f-d928-4597-988a-fb8e14d12dde/fuwaxiwonufedigivi.pdf
    • https://s3.amazonaws.com/rejiner/itunes_english_version_64_bit.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_05868e1094214233a5025450b547b011.pdf?index=true
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_fd397d9f8c414ee4ad0b6db163327c7f.pdf?index=true
    • https://s3.amazonaws.com/tifuwuw/jubuwapofapokalazomorej.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_80275890f42442caa368827c4af5bc19.pdf?index=true
    • 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_off0000e570.bin
7543bc86fde39b18624ab0bdb359420b20d6cbed7e1ad968c9afd0e124209c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5256 bytes
font_01_sfnt_off0000f774.bin
8c0a10c4d08835952896bb8378754ac835d36aa9d72262ef285b1e36fede5388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 10176 bytes

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