Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c42d5ab536d764…

MALICIOUS

PDF

439.8 KB Created: 2021-06-10 04:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81623544f4f971f4c5b636859a498b5c SHA-1: c292471f3d009d28db959bb73f8f500407532f7c SHA-256: 67c42d5ab536d764ff991b374037554d50ec857d43e010476c135f8ddfd114df
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing or advance-fee scam lure. The document body, though heavily obfuscated, contains references to 'Burger king bingefest nyt crossword' and metadata indicating it was generated by wkhtmltopdf, suggesting a deceptive lure. The presence of an external URI pointing to 'crysiq.ru' further supports the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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://crysiq.ru/pbw?utm_term=burger+king+bingefest+nyt+crossword
    • https://cdn-cms.f-static.net/uploads/4478667/normal_6065d878e740a.pdf
    • https://bifezogutagu.weebly.com/uploads/1/3/4/5/134598372/bd6af.pdf
    • https://cdn-cms.f-static.net/uploads/4369783/normal_6046fb0f207ea.pdf
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fc60fdf59b90.pdf
    • https://tedatigajixa.weebly.com/uploads/1/3/0/7/130739480/dasowugumim_lasalusivu_dureju_werusebalebege.pdf
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/zusujaparike_bupona_guroxo_wapotukimeguga.pdf
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/zekowiw-kesosuwelar-pulovan.pdf
    • https://static.s123-cdn-static.com/uploads/4387918/normal_60088ec0191a4.pdf
    • https://dibosowosobon.weebly.com/uploads/1/3/7/5/137511826/250e896d634.pdf
    • https://jogotipopawufi.weebly.com/uploads/1/3/0/7/130740597/292386193.pdf
    • https://kepamimap.weebly.com/uploads/1/3/4/6/134609022/7020170.pdf
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fe4a507ba06e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0b12d0e-640d-4d9c-8723-2de0232e46e9/49196732775.pdf
    • https://uploads.strikinglycdn.com/files/cb86c231-15b5-47ed-99cd-c23704d7f871/gamma_chapter_kappa_alpha_psi.pdf
    • https://uploads.strikinglycdn.com/files/50da4a46-efd3-48c8-84ce-f5ef1b3e5c3a/2000_jeep_grand_cherokee_4.7_v8_specs.pdf
    • https://uploads.strikinglycdn.com/files/cbab0cf2-369d-45c1-972d-af23a8cea0a0/votogavinakuwexo.pdf
    • https://uploads.strikinglycdn.com/files/c278f6e5-2be6-4879-aba0-4543b7a2d0ee/what_happens_when_there_is_no_quorum.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00067f24.bin
695bda25aad73d679d6913b1e44e647b93dc53fabfb99b6533d3ae20c90de211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F24 5396 bytes
font_01_sfnt_off000691b7.bin
c4ebd631f7f07ded4e164775c31c414a1cc1f74bca86e2eb617a964b26a4e71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691B7 11560 bytes
font_02_sfnt_off0006b930.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B930 16204 bytes

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