Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a6d120a25bcc00…

MALICIOUS

PDF

72.9 KB Created: 2021-03-24 22:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bc123ff3cfb98a519189a3e7d365bcf0 SHA-1: b6e1c66913cc87347516aadb341c7123cdc96a7e SHA-256: d1a6d120a25bcc0018f15ae8f1574076dbc0bda5d6ef8c0f37ca2d0b20984fff
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 risk score. It contains an embedded URL pointing to a suspicious domain, likely intended for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Astm b209-10 pdf'. No scripts were extracted, but the presence of an external URI and the overall detection profile strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=astm+b209-10+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466366/normal_5fdbc2e864359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_6044a0d709a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_600ed26d36247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5fd075cd6bf5a.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/XYjd3MI/24073673497.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423700/normal_5fc948b28f2bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_601b35fd74372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5fc5cce9c567f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_5fd9b0f7851ab.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/5vvDjch/five_nights_at_freddy_s_free_download_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fcc1abf3a35d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_5fd1e1f2627e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fce8285b3329.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/vudivuzakal/kalaziterav.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/losulimaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd6529f-b48d-4680-841b-0ab141c338b0/12509063660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e662a1-955f-4aaa-a5a0-cbc147db9627/76942653899.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/bol_tere_mithe_mithe_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/45824972357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6bdd6a-fa94-4137-8559-f9747dd1aee1/is_rorschach_the_end_is_nigh_guy.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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5492 bytes
SHA-256: e4dc8e2fec5b8a7e62bb51487b876000eab8d46e648ef57ea2039b0d12d88a9e
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10960 bytes
SHA-256: e9b74efacbe2fa07f39f3f0e56ddb990ade675819a92a92782ad01e14cc3c568

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