Malicious PDF — malware analysis report

Static analysis result for SHA-256 86923a2a488f75ff…

MALICIOUS

PDF

72.5 KB Created: 2021-03-24 00:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9761dc559bdb73918940bc5ad15418 SHA-1: 6a3569fe2ceb01648ab17026a8b8a41563878308 SHA-256: 86923a2a488f75ff15638b0debe786e0480152a352ba9a6617ffdefc9db0a3d1
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to writing a story, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crophysi.ru/wb?keyword=how%20to%20start%20a%20historical%20fiction%20story
    • http://nuviteb.22web.org/icom_2300h_manual_espaol.pdf
    • http://creditinquiry.info/4640646596l6qti.pdf
    • http://nofovukad.iblogger.org/kotegilujurituno.pdf
    • http://akb54.ru/16315457458yw2wy.pdf
    • http://crispyset.online/zepir1ce1c.pdf
    • http://private-channel.site/xozimatifekipojododitmv59w.pdf
    • http://fikapopupalake.iblogger.org/how_to_clear_cpc_exam_in_first_attempt.pdf
    • http://psylath.com/krav_maga_book_downloadeo6y4.pdf
    • http://wopizup.mypressonline.com/63880226170.pdf
    • http://dilomevoje.22web.org/chacha_bhatija_cartoon_video_3gp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedobufudajewu/vexor.pdf
    • https://s3.amazonaws.com/nunakixuma/r_basics_youtube.pdf
    • https://uploads.strikinglycdn.com/files/ddd15808-8dbf-45d4-beec-0a456c851a0c/samsung_smart_tv_55_inch_curved.pdf
    • http://nadezuj.epizy.com/37343716159.pdf
    • http://gemawinikifiv.myartsonline.com/english_speaking_exercises.pdf
    • http://gebutetivifupa.epizy.com/49823972112.pdf
    • https://s3.amazonaws.com/najipavez/53039007676.pdf
    • http://fasasipapuzu.rf.gd/taforosogunuwavuribimumu.pdf
    • http://diturasenupope.epizy.com/ford_mustang_repair_manual_download.pdf
    • http://zogadawedalifap.onlinewebshop.net/94066697926.pdf
    • https://uploads.strikinglycdn.com/files/b5ed39ac-f317-47fb-94b7-db9b70701ea4/homelite_330_chainsaw_for_sale.pdf
    • https://s3.amazonaws.com/tigewibejageju/daguvorerekunakakur.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbb.bin
6bc743ba63a749445b0a7b5d1a081cdc893034428662ad8b7d1fa025c3e7ba53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 5124 bytes
font_01_sfnt_off0000fd3c.bin
40d5d5456815dd03e416c108ccdcf2df183f639858b7984e82f0598b0d2b7d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 10264 bytes

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