Malicious PDF — malware analysis report

Static analysis result for SHA-256 62150372d3f8b2cd…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 00:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1523ceabaaf2a05475a7960576bf5cca SHA-1: 98033d90d71744f58381cc902467bea328551b36 SHA-256: 62150372d3f8b2cd5098edae08445a30994ac8f25012e77ae9601ef23654a592
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=text+to+self+definition
    • https://cdn.sqhk.co/sidigodoga/hdifsjb/anki_overdrive_starter_kit_fast_und_furious.pdf
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/519277.pdf
    • https://cdn-cms.f-static.net/uploads/4481819/normal_604e72e44a64a.pdf
    • https://cdn.sqhk.co/pigevikuwi/gjgidGj/15527711701.pdf
    • https://cdn.sqhk.co/sifilefu/65gdRhh/download_game_mod_join_clash_3d.pdf
    • https://debamivuk.weebly.com/uploads/1/3/1/8/131871977/vokamixegijulog-rufogubebabipeg-padojalogexok-fejasigamor.pdf
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/mowafojede.pdf
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/7615196.pdf
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/1222840.pdf
    • https://rawaruginoninum.weebly.com/uploads/1/3/1/0/131070401/gofotexulamegejenar.pdf
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/mevujuxadidig.pdf
    • https://cdn.sqhk.co/gunonutib/aufWsIq/okay_kaya_believe_chords.pdf
    • https://cdn-cms.f-static.net/uploads/4402948/normal_602b42e12f25a.pdf
    • https://cdn.sqhk.co/nefijisob/gez5GCB/pajurekubegabo.pdf
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/8533066.pdf
    • https://cdn.sqhk.co/pekotegafod/d3mQhdU/escape_room_mystery_word_level_21-_30_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lopadivupudexa/62016548632.pdf
    • https://s3.amazonaws.com/satudifin/barter_system.pdf
    • https://s3.amazonaws.com/rewepalazamiso/vositarerij.pdf
    • https://s3.amazonaws.com/dobesogum/jatijonarapedemikumaze.pdf
    • https://s3.amazonaws.com/mejifavo/guided_sleep_meditation_for_body_healing.pdf
    • http://www.readwritethink.org/professional-development/strategy-guides/making-connections-30659.htm
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed95.bin
cf93e0c4618998c7caab9755aacdc02da480c5807a3ec4c1a8f6f3d6b72e1bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 4612 bytes
font_01_sfnt_off0000fd60.bin
ce02c82530e91401f32f2e41dfc202a4ef0f587fbbb94c3d937cec384b8b4a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 10696 bytes

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