Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c173dc05120f01…

MALICIOUS

PDF

86.1 KB Created: 2021-02-28 09:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85c361ed1bf6394f3c4ae05e4401d3d4 SHA-1: d21d132145d04b04191645d62905c88d23917af7 SHA-256: e1c173dc05120f01bf5749e3e8cbe47e4b6668d961d576e2cdcad4d5d8ac351c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the presence of 'Pdf.Phishing.Trojan' in the ClamAV detection strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=june+19+2018+geometry+regents+answers
    • https://pezuzani.weebly.com/uploads/1/3/4/6/134631528/lijexeludopuze.pdf
    • https://cdn-cms.f-static.net/uploads/4407789/normal_5fe802e966831.pdf
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff664e77a84e.pdf
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5ff4cb8881f13.pdf
    • https://cdn.sqhk.co/perokokamosa/0ji6ia8/swat_team_meaning_in_software.pdf
    • https://cdn.sqhk.co/sabiwizi/dphcVJH/real_formula_car_racing_free_3d_game_download.pdf
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/3855124.pdf
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/ecd9e778fe9.pdf
    • https://cdn.sqhk.co/torujazelome/icGRhcn/z_nation_addy_boyfriend.pdf
    • https://cdn.sqhk.co/xufojidaju/kig7ib3/54328632859.pdf
    • https://vujalonekodi.weebly.com/uploads/1/3/2/7/132712286/5839737.pdf
    • https://static.s123-cdn-static.com/uploads/4383149/normal_600878df4f3ab.pdf
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fda73676347d.pdf
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5ffec1dad2085.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd687759316b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://titugol.atwebpages.com/letomegubuturezabawez.pdf
    • http://mivajale.rf.gd/creatine_taking_guide.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin
5690691cb44c97b5821750ea9bad3d9bf3a69ffb7c7d7ab28efe9bac7255dd9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5668 bytes
font_01_sfnt_off000103b3.bin
71d282cecfd1983522495c09945f85a04018426d76d85c92e96520a75f3b3651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10444 bytes
font_02_sfnt_off000127ba.bin
062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 16072 bytes
font_03_sfnt_off00013c59.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 4324 bytes

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