Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dfcfba19b78d2b…

MALICIOUS

PDF

86.5 KB Created: 2020-12-31 00:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d931e98cbdfa11fb50fa5faf32bf5213 SHA-1: bd27e9152b239e520a32e82473b1fa0afacd480a SHA-256: c3dfcfba19b78d2bb7042e5c167d51b447c72c31dbb653d7e3e5290f6aed7bb8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with the primary URL suggesting a lure for free in-game currency. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/strik?utm_term=app+para+ganar+diamantes+gratis PDF link annotation
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/82df24fd2b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f8b405b9da51.pdfIn PDF document text
    • https://kikunuwip.weebly.com/uploads/1/3/4/6/134687028/kavarakukidi.pdfIn PDF document text
    • https://wajutuba.weebly.com/uploads/1/3/4/6/134656264/cf2469e368b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fbd2a3a4cde4.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/xisufijusut.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/jupugimosenutojulimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5f9e36e12244f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/604358f9-359b-4eed-978b-6e1ff9a07b49/lekomimufut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd61d5d-dbe7-4dd9-93d4-fe24a0122c76/segotuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0ceb22-5020-4dd6-a8c2-0c15c07c860d/ritejiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e0873d-61d1-4f88-bd75-23828b23a258/gotuseduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe7daa0-2d81-4a00-b8c6-d295342f1a47/sbux_stock_price_today_msn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf64871-0b57-4e5b-8f74-4bcea2125e48/40553469049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663208ee-c5ad-4fec-a287-faf31e058321/5844217017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfe4cdb-bfd2-4642-8403-e2afef5c7918/rv_shower_pan_with_toilet.pdfIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 5236 bytes
SHA-256: 4aadb865628afb1f4d204cb31390c0373ed3aaca3bdec33b2b1d5518a8ad6a79
font_02_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_03_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 11260 bytes
SHA-256: e04d456674c3388a9668f2a47afd0347e1ba58880f38aff4ad17eb8c51d22f8e
font_04_sfnt_off000134ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 16208 bytes
SHA-256: fe139538347d724e6b27dab22ead91fbb1eb3470a850438049392072e7f85921

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