Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8720ef17ce15a10…

MALICIOUS

PDF

78.3 KB Created: 2021-01-12 11:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e130ff321e864cf1f657a08622b13f82 SHA-1: d1390d8432a98eb727bea0c5a9b76dedfc7af0cf SHA-256: b8720ef17ce15a104f57e94c17c504fe50d88dbef576db70f031975b9099980e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm hosted on disposable domains. The embedded content suggests a lure related to a movie song search term, likely to drive traffic to malicious or spam sites. ClamAV and ML classifiers confirm its malicious nature, indicating it's a phishing or SEO spam document.

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://traffnew.ru/aws?utm_term=bhoothnath+movie+song+ming PDF link annotation
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/fukapekeso.pdfIn PDF document text
    • https://site-1083588.mozfiles.com/files/1083588/23495721100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fc0a6ec9c637.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/w0gcgg2/8823755435.pdfIn PDF document text
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/f35f2392a068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fa784a2d591a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5fb7c3ba9debb.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/a425435408d.pdfIn PDF document text
    • https://site-1233197.mozfiles.com/files/1233197/78799833116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482870/normal_5fcce22a6cfea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_5fe72f5d8216e.pdfIn PDF document text
    • https://site-1185109.mozfiles.com/files/1185109/lazanuzew.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 4868 bytes
SHA-256: 69a1f08a2c01111fad6413f8e3e69a182f252096115940f1f1fdc7b3f5ac5bd7
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 11260 bytes
SHA-256: 5af5479c0fa8ddc3c1e45229322b1edfc1b2f56799021c6e8eb062c488516a9f
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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