Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3eb14ef4b4bfc5e…

MALICIOUS

PDF

85.1 KB Created: 2021-03-20 04:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e13f3e1b30e725e494783ee3d790ab2 SHA-1: 761a63eed0bd868c26629067d23d774a6ac6f79d SHA-256: d3eb14ef4b4bfc5e169771bfe20278d8ef9f12d5e32ab372a22defbb31080b41
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'book pdf download'. The primary IOC is the external URI used in the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=coraline+book+pdf+download
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fe6783bd7df5.pdf
    • https://static.s123-cdn-static.com/uploads/4449776/normal_5ff39cb2bbcae.pdf
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5fc65bed54ebe.pdf
    • http://wedipum.mygamesonline.org/37210655867.pdf
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ffcc61ba6486.pdf
    • https://cdn-cms.f-static.net/uploads/4378621/normal_60466fd593fe6.pdf
    • https://static.s123-cdn-static.com/uploads/4446161/normal_60088a115a1a8.pdf
    • https://static.s123-cdn-static.com/uploads/4420224/normal_60012bfbc8366.pdf
    • https://cdn-cms.f-static.net/uploads/4462736/normal_60128755bf53d.pdf
    • https://static.s123-cdn-static.com/uploads/4497658/normal_5fcaa11aabc31.pdf
    • https://cdn-cms.f-static.net/uploads/4389823/normal_601dd7c7f40aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pesetufavo/geserebikejuvi.pdf
    • https://s3.amazonaws.com/temujonuwu/boat_browser_for_android_2._3._apk.pdf
    • https://uploads.strikinglycdn.com/files/aef31a52-ad63-4ed2-a6ca-bb420ca06b98/37661591426.pdf
    • https://uploads.strikinglycdn.com/files/d2d85cbb-d126-49a2-96df-fcb5b7075d63/beowulf_a_new_verse_translation.pdf
    • https://uploads.strikinglycdn.com/files/a0506359-d331-4046-9de9-b5dc595907ba/genie_8_gallon_wet_dry_vac_instructions.pdf
    • http://timerojulawu.myartsonline.com/carboxiterapia_protocolo_tratamiento.pdf
    • https://uploads.strikinglycdn.com/files/516bcf98-ed64-4654-9a7e-ca08953dd1c7/98087587232.pdf
    • https://s3.amazonaws.com/jidosatikim/kibejupat.pdf
    • https://uploads.strikinglycdn.com/files/8baaf66e-5c19-416d-b71f-b129bcef7b81/who_sells_troy_bilt_tillers.pdf
    • https://uploads.strikinglycdn.com/files/68c9bcf3-caa0-4be2-94a8-9a7919baeb99/52686669609.pdf
    • https://s3.amazonaws.com/xanunafojuloki/flowers_of_evil_baudelaire.pdf
    • https://uploads.strikinglycdn.com/files/6806f7a6-ccd6-4b7a-95e6-24f42ebc0123/72973960782.pdf
    • https://s3.amazonaws.com/kisagoz/wokipijonaninitog.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_off0000e977.bin
676860a6376e3b125e0739302286b0f50553d5cb254b3c5616fe8022a846158e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 5060 bytes
font_01_sfnt_off0000facb.bin
97eee7736379a4b4312327cc6dc58f085ddbd3632716a8f21d1ce1586f162299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 24308 bytes
font_02_sfnt_off00012fb4.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 16204 bytes

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