Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8b7e1d4f5ebae4…

MALICIOUS

PDF

120.7 KB Created: 2021-01-02 05:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7b71782d35ee6322ede62537e4a26aef SHA-1: 3aafc3d93afee770ad0d08c75733c5a3cf70cf22 SHA-256: 6a8b7e1d4f5ebae4cefb2dd984f608b42b0be8438019f252953c6323ecb19c68
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or trojan distribution attempt. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://ggtraff.ru/123?utm_term=ang+probinsyano+dec+12+2017 In PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/sawivazifesawud-xusegimadodebu.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/594c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5f949addbc275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5fc11034c3d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5fa485da98c7b.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/ropajen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_5fa3b13faa401.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/wowobu-tazik-moredixasetexeb-favipejanivases.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/8c6330de4.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/vofoletetu-junazegolatan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5fc833d215763.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/pegomu-sisotazoloxi-gedupumu-leponuwufezave.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/kijuwisaturikef_rapazodegagu_zagegij_xewaxebig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/feefcfc0-9ebf-4c82-b508-a4e6428ffd5d/unblocked_games_77_earn_to_die_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88eb746b-6620-4f5b-be47-72fb1d68105c/list_of_yugioh_filler_episodes.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_off00019b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B67 5844 bytes
SHA-256: 16a993a6c62b555f664f23300194b47b547f3621f5d63c3a0c337fc64063896d
font_01_sfnt_off0001af6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF6B 11800 bytes
SHA-256: 253339637a452ed8c212eb4035c282c418cd83dd790199a9c973df3b454565c8

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