Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b7f270dbc99158…

MALICIOUS

PDF

170.4 KB Created: 2021-03-15 14:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 51a326e2174d8191c6040bbe2b06599d SHA-1: 952df33dda3d6629d453f5cba2ef531bf05d1942 SHA-256: 39b7f270dbc99158e6231954d9fe282b5d6b151d2580df239ec3991a6b35fb06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=thunderation+silver+dollar+city PDF link annotation
    • https://cdn.sqhk.co/tumowara/Oidihgg/77262207990.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/bhgevgi/king_coin_laundry_cambridge.pdfIn PDF document text
    • https://bilukejax.weebly.com/uploads/1/3/5/3/135392742/b97209a.pdfIn PDF document text
    • https://wafitaweligu.weebly.com/uploads/1/3/4/5/134587259/1087624.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/f305a8aaf0631b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_602fa5a8968be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fe346e317180.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384299/normal_5fceaf3749951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5feb4b1a1b6d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_6046224ed1732.pdfIn PDF document text
    • https://gomimujetaveve.weebly.com/uploads/1/3/1/4/131406784/68c635ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5ffcfe223696d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_6013bb92c816b.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/jupasiwojom_xawarulemegeja.pdfIn PDF document text
    • https://cdn.sqhk.co/kajemuwasutu/Ejevwid/12300804040.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/bn7bUjj/rirovereko.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/dhgheib/happy_fall_season_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5ff717c8c928d.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
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_a11183a78bf04193ba79e3f4550f044b.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_ad1ac405e3cb457f9623bad3957389d4.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_7dc6f6a3491a4c739f1e0f84e5dc3f47.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_41943a155fe148e7a935e9abb3507a5c.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 116744 bytes
SHA-256: 52e3a6455732c42075b433399f65be8625e0e359712fadf653d90812943bb1bb
font_01_sfnt_off0002557b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2557B 5020 bytes
SHA-256: 87766a26beaeb40cdfc6aee7e72d830857aa0e61ad0e783bb418e609e09baf2e
font_02_sfnt_off00026681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26681 11016 bytes
SHA-256: e532cd6a6e03b6d53b0af20e87f806394926990d48a76ef1f3853cc1d29dc2a5
font_03_sfnt_off00028bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BFB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c