Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0bedae951354a3…

MALICIOUS

PDF

80.9 KB Created: 2021-03-17 19:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed79a7c5108977acad038a3ee7a15352 SHA-1: d54a040039af3b3544efdd29d8149861fb91dbb7 SHA-256: bf0bedae951354a3a83e0d3a68aa3161c2d6bea446c4e546524c0305be860d56
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body is heavily obfuscated, but the presence of the external URI and the overall detection suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is leveraged to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=asphalt+institute+manual+ms-19
    • http://gazzsheff.xyz/day_and_night_worksheet_for_grade_1ui66p.pdf
    • https://cdn.sqhk.co/bifugudawesu/icjghak/snapchat_score_streak_record.pdf
    • https://cdn.sqhk.co/xibetevoxaj/difq690/republic_of_china_simulator_2017.pdf
    • http://24goodstore.site/relentless_from_good_to_great_to_unstoppable_audiobook_by_tim_s._groverbjxtg.pdf
    • https://cdn.sqhk.co/wudenedu/YBlhvQJ/bopusogo.pdf
    • http://health2health.online/bomemuwevul7obc.pdf
    • http://voicebftyi.com/17247942315y7bry.pdf
    • http://vandify.com/skype_mobile_video_callf7oz6.pdf
    • http://hayatevesigar.online/20557234989rgny0.pdf
    • https://cdn.sqhk.co/devisofage/dpKiahj/slot_racing_system_lightning_mcqueen.pdf
    • http://jiwabozaxexe.mypressonline.com/38563044657.pdf
    • http://connexion-amelii.xyz/51714327778bdig5.pdf
    • http://zumewidife.mygamesonline.org/toshiba_satellite_l750_drivers_windows_7_32_bit.pdf
    • http://toppiksnack.xyz/683335108294mt4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tanapilamaxi/gelutizakefinotaziv.pdf
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_04a31768e1d44aa9b103914d991aa9c3.pdf?index=true
    • https://s3.amazonaws.com/serogajugomiji/xodejopunibabi.pdf
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_9e65382a2aab42659553106fb9d97c52.pdf?index=true
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_8380447ca41d4a2d991e4addef9d0c2f.pdf?index=true
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_5ef53840f0514cc2b3c26a610984e9ed.pdf?index=true
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_6c2a4544feb5430f9b488dc72c767889.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f003.bin
a0f851ef7d4b4970d669b9ee2cb1acf8536ed6aef9fb998871bf909b3e383c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 4964 bytes
font_01_sfnt_off000100b3.bin
4bd809548d0c76b0ceb61de9bec47e91979b10c9cb494c652f4f2d6b3b819855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 11320 bytes
font_02_sfnt_off000126e2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 4324 bytes

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