Malicious PDF — malware analysis report

Static analysis result for SHA-256 31db365f9e80d25f…

MALICIOUS

PDF

75.1 KB Created: 2021-02-14 12:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d02fe6a5484256e7a2ddb5a85968856 SHA-1: 8a27a3c5c7ca60a8916fde328e3b68a17ebdc719 SHA-256: 31db365f9e80d25f1684c9529ebc7f472dc51ce87fa3139ca8f77bf5c2a4fe5a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one prominent URL pointing to a domain associated with keyword-based redirection, suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains text related to academic materials, which is likely a pretext to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wb?keyword=cambridge%20book%202%20test%202%20listening%20answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fdb588f029cb.pdfIn PDF document text
    • http://bigowet.xyz/rare_beauty_selena_gomez_ulta39brk.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/ed046128.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/63909772183.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/dZjbIgJ/xukuvujeladorugubob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6011e677280bf.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/giwopfvf77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fdf4a2503872.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/Thi5C5n/forward_assault_remix_controls.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/gubogibokuzepexanew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_601b43b2ca630.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/ha7wqtJ/soccer_world_cup_2019.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/3931390.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/bibRhfI/braided_knot_hair_salon.pdfIn PDF document text
    • http://test123test.xyz/33994085063rjg03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ditinalozevid.epizy.com/pitapi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5480 bytes
SHA-256: a07a6fbac2831d479acbc41868680e6f33fa8ee952296c90f9f0468d1e1289b1
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 10956 bytes
SHA-256: 833048a6f9139d32643dd8d06ae6382adae0b3064590ab4119360b46b32516b8

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