Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13db03a28400173…

MALICIOUS

PDF

85.6 KB Created: 2021-03-18 17:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdeb9bb070b8f48fb318aaffac03222f SHA-1: 739b8319ecb72fd22c101b1c0a75905f4c0d4f15 SHA-256: c13db03a28400173ccbf64e0b79aadcca9800c32f7fd46e65c245920c9aad877
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to a keyword-rich search result, suggesting a tactic to attract users searching for specific content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or malware distribution intent. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

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://zajinet.ru/wix?keyword=wrath+of+the+righteous+city+of+locusts+pdf
    • https://cdn-cms.f-static.net/uploads/4413862/normal_6030e2211c2de.pdf
    • http://tinesoxexi.22web.org/4330640748.pdf
    • https://cdn.sqhk.co/momujolo/Chegh8g/how_to_install_automower_connect_kit.pdf
    • https://mobuwutibuw.weebly.com/uploads/1/3/0/7/130739624/6106315.pdf
    • https://zubajabazu.weebly.com/uploads/1/3/4/4/134466761/8308706.pdf
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/jibolidiwaza-xukiga-jidalolafakuti.pdf
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/5f81c7.pdf
    • https://muvaxajipafe.weebly.com/uploads/1/3/5/3/135313420/715eb.pdf
    • http://diletemofuvufu.22web.org/cartoon_love_pictures.pdf
    • https://lomurawejajiku.weebly.com/uploads/1/3/4/7/134732321/lasoponupawowivuj.pdf
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/jawonube_mabugujir.pdf
    • https://cdn.sqhk.co/zolilobup/a1Egch4/double_layer_gun_belt.pdf
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fe4836dd91e6.pdf
    • https://fozibopabedabe.weebly.com/uploads/1/3/6/0/136082219/5993728.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_9f4b623ce1b24c159561325519c3c47a.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_7b887fd1fdde40759d3c825bbbcbdef2.pdf?index=true
    • http://xirosad.epizy.com/jubafelutulowetosuro.pdf
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_919d630feaf549d8b5f79da289987cdd.pdf?index=true
    • http://luremugaxufarup.epizy.com/certificate_award_template_ppt.pdf
    • http://lisirowi.rf.gd/13644241193.pdf
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_3cd557450ff243399dfca93c1bc24d9d.pdf?index=true
    • 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_off00011148.bin
118a8fecdcaab4efa2ad1148451b3f12f8c403e804c562924f9497592189c7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 5532 bytes
font_01_sfnt_off0001242f.bin
e070093d90c2fa92569b96fbd94f3b79d6521d381e03148492aee97c14e5015c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 10896 bytes

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