Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5d99c553035656…

MALICIOUS

PDF

79.2 KB Created: 2021-04-19 12:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f67f72b5f9a1b88f02c9f2f7214610cf SHA-1: de7f226939fca71715443a794876e2cb57ca6831 SHA-256: 8e5d99c553035656fbdf04945f3215ab6ecda91ac72131fa966371df493df95d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=how+to+know+if+a+molecule+has+hydrogen+bonding
    • https://cdn.sqhk.co/sativomofij/UbRGchh/escape_plan_the_extractors_cast.pdf
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/bf724.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/jonibawe.pdf
    • https://cdn.sqhk.co/wevosevob/ijfha1y/mijapokezuremikukasobi.pdf
    • http://kinerexasuxemo.getenjoyment.net/97029350220.pdf
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/8711368.pdf
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/1887763.pdf
    • http://lozejebivo.scienceontheweb.net/wokevadaxozekolowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/libusamagowuvo/arm_knitting_instructions.pdf
    • https://s3.amazonaws.com/lusabifef/vasujewiwimisigosulabe.pdf
    • https://s3.amazonaws.com/remeranexe/the_missing_season_2_episode_5_review.pdf
    • https://s3.amazonaws.com/radubozufiwo/in_their_eyes_were_watching_god_janies_character_development_constitutes_the.pdf
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_f888f35a8438456ba00e31ad2b9e21b7.pdf?index=true
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_23b4197ed4034d48a6d37b80b7f3c8f9.pdf?index=true
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_35e9f06f6a964b1f94d4d6401f92afac.pdf?index=true
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_c158d1ed04d540f2b8202519e3467217.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_83e5ab4ee1b54c60bee5af2041b9080b.pdf?index=true
    • https://s3.amazonaws.com/samopakamefap/learn_latin_textbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f0.bin
84a3d2613516ec02a3a1680b8a789a677471f639a05a7d8f4ca572d022134c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 5676 bytes
font_01_sfnt_off0000fd1d.bin
6535f41e6843183e2ac5d197766b959af9a9840bfe95382a850850d079f2a689		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 10680 bytes
font_02_sfnt_off000121a0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 4324 bytes

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