Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c13f99397481865…

MALICIOUS

PDF

74.0 KB Created: 2021-04-01 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86920aa60874a986bea1f1524ef6a54 SHA-1: 5f0d8dc02230f6f2e81ab45f2b7be03f0c0148b0 SHA-256: 8c13f993974818656e3f06a114176d57ec1defbdd655180980e0ee9896529219
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm strategy. The primary URL suggests a lure related to a 'mental ability test'. While no scripts were directly extracted, the presence of external links and the ML classification strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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://leonvi.ru/award?keyword=mental+ability+test+pdf+download
    • http://ramerofebib.iblogger.org/82854721250.pdf
    • https://vabiwedewu.weebly.com/uploads/1/3/0/8/130813601/venanux-fefoxator.pdf
    • http://akvatehnika74.ru/52856425122n4se7.pdf
    • http://dmdmassage.com/metric_conversion_worksheet_high_schooli6x3g.pdf
    • http://phrensy.co/dometic_3_way_fridge_user_manualvkx40.pdf
    • http://discount50it.pro/livadurafew6hy2p.pdf
    • http://bnatural.space/997009805470wog5.pdf
    • https://sozaruterir.weebly.com/uploads/1/3/0/7/130738534/6899035.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fulazelof/best_washer_and_dryer_set_under_1_000.pdf
    • https://s3.amazonaws.com/domegagowevag/bubirubupafolupupu.pdf
    • http://jidoxib.rf.gd/lojisadogamuzanasezo.pdf
    • https://s3.amazonaws.com/varoximu/reading_comprehension_worksheets_for_3rd_grade.pdf
    • http://nusavigosewu.epizy.com/paruxojoduburip.pdf
    • https://s3.amazonaws.com/kovilowab/volume_compound_shapes.pdf
    • http://kolegigogar.rf.gd/fedodenug.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_off0000ddce.bin
8657ece85b1f1396716a96854e57490ceb14b8e3da353824921a784b39b3e9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 5276 bytes
font_01_sfnt_off0000eff4.bin
e150cb463edff2e93967c4cae14ce267cbbe6a639395a4341da32c4e418b7759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 12220 bytes

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