Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c15c652432ed58e…

MALICIOUS

PDF

68.4 KB Created: 2021-01-05 06:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 906f305df7a0048b8be65231559c6cf2 SHA-1: e7776aab43ca328bbc63979cf0e2de1082807167 SHA-256: 0c15c652432ed58ecdb4872a0a85a56834d4938596a37644995d62e57a9f4766
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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
  • 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/aws?utm_term=multiplayer+shooting+games+for+android+via+hotspot
    • https://temozune.weebly.com/uploads/1/3/0/7/130738928/wadupejegegalo-vatipekojibetaz-rirexixoririmim.pdf
    • https://cdn.sqhk.co/sebixodof/hgisicb/15854364774.pdf
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/taxobasize.pdf
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/6585938.pdf
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/925105.pdf
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/tuwuputubapejasaju.pdf
    • https://vobelorigod.weebly.com/uploads/1/3/4/0/134096073/wuzaxiniriwesupavit.pdf
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/588095.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/gugar-zetuxasawep.pdf
    • https://cdn.sqhk.co/gagupibi/EhiIJjj/ninja_star_shuriken_diagram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zunaduxa/46375654762.pdf
    • https://s3.amazonaws.com/xomudufe/serendipity_accidental_discoveries_in_science_answers.pdf
    • https://s3.amazonaws.com/juliziwojatige/song_achutam_keshavam_by_ankit_batra.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_off0000ceff.bin
ce31102b87a9f2ee5dc1e156f204ffaf4e687e6a8312d60725e7351516b4c1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 5624 bytes
font_01_sfnt_off0000e210.bin
6cc0b1a92d8243e0d10abb0c0fa93876b9f245bf60ed8716c51136d45e1d2659		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 10128 bytes

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