Malicious PDF — malware analysis report

Static analysis result for SHA-256 7040114f5ebd4305…

MALICIOUS

PDF

72.4 KB Created: 2021-02-12 02:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6300dd84974adbcfa8c35b004915f7 SHA-1: 22377e336c0a4ee56afeb7fe62cfd13f3507e29c SHA-256: 7040114f5ebd43059f49ae790dd16dccf0e8b2e016a5705d0286fc3c40e534b5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'jacksth.ru' and a keyword suggesting a lure for educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=worksheet+periodic+table+trends+answer+key
    • http://twobigs.space/generic_adderall_dosage_adultsj0hfq.pdf
    • https://lidixegivutowo.weebly.com/uploads/1/3/1/4/131453330/poluluwatapumunipezu.pdf
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/zutiritedat_narujeti.pdf
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/9128178.pdf
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/fetenusenak.pdf
    • https://fivarebaxuru.weebly.com/uploads/1/3/5/3/135326201/1438898.pdf
    • http://rimka.xyz/farixemefoxariix971.pdf
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/pafokap.pdf
    • https://sumokexopusoval.weebly.com/uploads/1/3/1/3/131378975/zobon_gipumezefo_bavuwiwemusa_xunukazatabilu.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/f2f63a5479.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/medaliwifufugel/2228979.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/spaghetti_marshmallow_challenge_worksheet.pdf
    • https://s3.amazonaws.com/nuxomigo/parotimufedinimebideke.pdf
    • https://s3.amazonaws.com/lixasifasi/siemens_built_in_coffee_machine_instruction_manual.pdf
    • https://s3.amazonaws.com/pibajuwi/46736834725.pdf
    • https://s3.amazonaws.com/vebogotexaf/not_your_barbie_girl_song_ringtone.pdf
    • https://s3.amazonaws.com/juzewojavomofew/welufakimerimitefemazo.pdf
    • https://s3.amazonaws.com/mikibetiv/44270592370.pdf
    • https://s3.amazonaws.com/jivuxo/29143742616.pdf
    • https://s3.amazonaws.com/tobojelusiwi/baby_photos_in_hd_free.pdf
    • 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_off0000dd9c.bin
969628af358980f94bdf73521035be3a048015f1c2cb83ca69e71ca317ca6195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 5572 bytes
font_01_sfnt_off0000f09f.bin
26c8a735d1294768c11b32b96ab36789e6b784f164c9e8107eb5e8e63e90ff6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10332 bytes

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