Malicious PDF — malware analysis report

Static analysis result for SHA-256 162affd688b8a6f4…

MALICIOUS

PDF

70.0 KB Created: 2020-12-01 14:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6dc117232b5fdcdc88fe74517fa9b2d6 SHA-1: c057583d7cc8e94dfd7b0b31f3759ad501ed7041 SHA-256: 162affd688b8a6f47dcca2d944b32e5d074ed471019c71adec2b4dfc26280b45
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous links on disposable hosting indicate a phishing or scam attempt. Although no scripts were extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

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
  • 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://traffine.ru/wb?keyword=angielski%20s%C5%82ownik%20obrazkowy%20dla%20dzieci%20pdf In PDF document text
    • https://guxodovuze.weebly.com/uploads/1/3/4/3/134333652/nixeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5f8df2c76091e.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/loniva-mukalopezaz-fewawawosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_5fc3299086a9f.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/baxilofirusivox_gujodotem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fb2d2be1367e.pdfIn PDF document text
    • https://ligetivegivug.weebly.com/uploads/1/3/4/0/134041815/7099732.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/8d0cc83f45.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/8efae9c64a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5faf5e69723a2.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/063c0eaa-5c67-4e6d-93fb-76a371587694/vebakokewezasolalefapep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0efc3b8467722f1d478d1/t/5fc13293fa04221c714afd5e/1606496917180/how_to_mod_vpn_apk.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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 5816 bytes
SHA-256: 1b2f3b5aa63d0421e30271b4472ec688b39f82547aa325ea9f21d76fd02be20a
font_01_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 12196 bytes
SHA-256: d0034884da33af2d589aa79a9375d2039aa638d0e388fea5d8aa47f0ea72fd9e

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