Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5da2b8d6a26a06…

MALICIOUS

PDF

75.1 KB Created: 2021-02-17 20:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2e8c9ab43e2455d58e06744b88471e2 SHA-1: b60e9e05fc396a786ec8452a45ad95a78fb75d09 SHA-256: 7c5da2b8d6a26a068a661caaea6eb17f6f3f54f54ba50adbd46f4e268e293287
136 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high-severity heuristic indicating an advance-fee scam lure. The document body, though heavily obfuscated, contains text related to 'how tinder works algorithm' and the embedded URL points to a domain that appears to be part of a phishing or scam campaign. The presence of PDF-specific heuristics suggests exploitation of PDF vulnerabilities to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://druttle.ru/wix?keyword=how+tinder+works+algorithm
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5ff430eb8237d.pdf
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5fcfb3909e41a.pdf
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/4815610.pdf
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/262c1b29a07.pdf
    • http://shishkin-seed.xyz/primadonna_elite_ecam_650._75._ms_manual6ihxx.pdf
    • https://cdn-cms.f-static.net/uploads/4413978/normal_6019c8e98adee.pdf
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fe194e567686.pdf
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/mowufagitimu.pdf
    • http://studytogether.fun/chesapeake_shores_episode_guide_wiki1y4my.pdf
    • http://remont-kvartir-otzyvy.moscow/wemurigidufedum0bmyv.pdf
    • https://lifefoxametuzov.weebly.com/uploads/1/3/1/3/131383893/zumotodupunaf_xorobilu_binuzuxu_zimavobap.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6013653e95067.pdf
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd255e43fcd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genedonapubefe/89547407680.pdf
    • 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_off0000ea44.bin
e457049f64d0368091d283f2e28dd69b5e97b53f32ab22c953043c509d5ecc9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 5356 bytes
font_01_sfnt_off0000fc5e.bin
4729778f480d359dc766cd7811ff26aa60af5bdd0d32c073bd63ef34a326abcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10288 bytes