Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe916d0528ed00d…

MALICIOUS

PDF

76.5 KB Created: 2021-01-12 02:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 83e40ec7d0d5fbe1a14915aadf8f0d52 SHA-1: bd72c25432fe221d61d10e75a7f8121f6c655ba7 SHA-256: 1fe916d0528ed00d5ea7f085507282aed85cce9875f90224cc9787735291ce73
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating it functions as a link farm. One of the primary URLs extracted is 'https://traffnew.ru/123?utm_term=fallout+shelter+unlimited+lunch+box+apk', suggesting a lure related to game downloads or similar content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=fallout+shelter+unlimited+lunch+box+apk PDF link annotation
    • https://cdn.sqhk.co/dajebala/ggiLqlE/breadwinners_menu_plano_texas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f8d860fc879e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f9aea2263948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5ff928d28e09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f9887e229ec8.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/dje6jie/14171974404.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/0H3licJ/puvusabimorofogiwanugut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ffcd2133eede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5fb2fa20190eb.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/lonew_xexasar_benavuvi_kipako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f89b456af56d.pdfIn PDF document text
    • https://site-1171585.mozfiles.com/files/1171585/gogudujodibo.pdfIn PDF document text
    • https://site-1177042.mozfiles.com/files/1177042/battle_chasers_nightwar_trainer_24037.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/b1z1pia/87407950131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5faa75116d983.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/aLhbidt/83585334050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 5540 bytes
SHA-256: 497186272107cc4984a1ce4e573e35c9db4f8f480813c593a3c0c5b71be7e18d
font_01_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 10552 bytes
SHA-256: c93ec966d60c2a8c93576e9c2e68dbd1f6f0746e9c369b78d430ec88e01b3266

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