Malicious PDF — malware analysis report

Static analysis result for SHA-256 153a44bd1b6feb03…

MALICIOUS

PDF

72.3 KB Created: 2021-01-16 22:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b529005aaef76d018ae192a3c50d72e9 SHA-1: b6ab2896fe2ed53c2c820d8d1a796abfc14ceeaa SHA-256: 153a44bd1b6feb038a2a2f0e2e1a811bc3ebf40960d5446e02575105924665bd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the document is a malicious redirector and a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=physical+science+assessment+probes+answers In PDF document text
    • https://site-1174464.mozfiles.com/files/1174464/zeus_s_sister_and_wife_crossword_clue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fa5bc1c1dd4c.pdfIn PDF document text
    • https://site-1178598.mozfiles.com/files/1178598/74434825119.pdfIn PDF document text
    • https://site-1168092.mozfiles.com/files/1168092/15_electrical_circuits_worksheet_c.pdfIn PDF document text
    • https://site-1174816.mozfiles.com/files/1174816/luketemupomixonesanosex.pdfIn PDF document text
    • https://site-1239330.mozfiles.com/files/1239330/23951066113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f8d1e3d89718.pdfIn PDF document text
    • https://xevulejokidowi.weebly.com/uploads/1/3/4/6/134680820/7243f86a77fd62.pdfIn PDF document text
    • https://site-1168430.mozfiles.com/files/1168430/ethnic_wear_online_shopping_websites_usa.pdfIn PDF document text
    • https://sijoxedewi.weebly.com/uploads/1/3/4/3/134346210/gajuwefatojoz.pdfIn PDF document text
    • https://site-1192597.mozfiles.com/files/1192597/reloxomozodevaguwa.pdfIn PDF document text
    • https://site-1168324.mozfiles.com/files/1168324/giroxapidije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366661/normal_5fe174bd318d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/garage_door_opener_ratings_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/collections_in_java_with_examples.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 5508 bytes
SHA-256: 620f9d8f6b565986dd37134bcaa26cc62ddd393e00cf4b4298b43b6a6010b9fe
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10380 bytes
SHA-256: 0be283fe59574e4e8e5ade32a5b361ab8dbee540a0dba7ae4d034d12d1f66b81

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