Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9bc8e3e4f65f71…

MALICIOUS

PDF

162.4 KB Created: 2021-03-17 13:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 72d9886475ff27a183479378d936b474 SHA-1: 5dd5785c1311391d0eadc587b247ad23b7c82089 SHA-256: 8c9bc8e3e4f65f71bd4957ea57a072196d7bd6f87269e60488d2da4134f15451
144 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, with heuristics indicating it contains an external URI and uses urgency lures. The document body, though heavily obfuscated, suggests a lure related to 'Avernus 5e pdf'. The primary malicious indicator is the embedded URL pointing to a suspicious domain, likely intended to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/award?keyword=avernus+5e+pdf PDF link annotation
    • http://mafujewulig.66ghz.com/53275716335.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/qgeibhb/96100282206.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/gijaUhd/xekurokogadovutezabupozaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60112add7c6d1.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/kij1ieR/52652847293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_6041ce7d09052.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/M0heShf/44157346049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanubili/xivakepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f68cd38-63f4-4c9a-a8ea-3fd2b34b9f52/lao_shi_hao_meaning_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be5278a-0ce6-4f76-a10f-e8388c1c81c8/37551153402.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/chris_brown_songs_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/17687459541.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/geloxomifekuwegadudeweba.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/tesco_email_address_format_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9c1223-1a50-4c01-8beb-4be67678f983/2017_ktm_300_xc_w_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87420389-7f5d-4709-b39c-0fe1bfdb85cc/50880938447.pdfIn PDF document text
    • http://duzobujunetokuz.epizy.com/alberta_map.pdfIn PDF document text
    • http://vokutenux.epizy.com/asus_motherboard_m4a89gtd_pro_usb3_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6c847c-66bc-4754-9f98-3d04d290efd7/24507239834.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000244be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244BE 4964 bytes
SHA-256: 20ac2cc7db0c6cab3e785098df5ad954b7275e0ee5582a9a59d143d438002586
font_01_sfnt_off000255c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255C3 11160 bytes
SHA-256: 65e94e95cdd05a9f4c916c849519e38fb39243b1b900c8a8e1b5a60deb632ec8

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