Malicious PDF — malware analysis report

Static analysis result for SHA-256 935d112916590d4c…

MALICIOUS

PDF

72.0 KB Created: 2021-03-19 19:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3ed1986e3873233d024bf1085ac58308 SHA-1: 2eb0d67d87469ab41c1e068efb8325ecd23745bf SHA-256: 935d112916590d4c056403d0e15fdf143e63d14d83e397aa83b4159c4ddc35db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware delivery. No scripts were extracted, but the presence of malicious URLs suggests the document is designed to lure 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://dafemum.ru/aws?utm_term=romaine+lettuce+calories+100g In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5fe63e20066ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_6015c22a95781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_60073ee912369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503390/normal_60076e33c85aa.pdfIn PDF document text
    • http://bezigex.iblogger.org/what_is_circle_graph.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezepegu.epizy.com/java_1._8_0_64_bit.pdfIn PDF document text
    • http://mujozitovisiwud.rf.gd/lumenupolejubibito.pdfIn PDF document text
    • http://wafubarig.epizy.com/52949842979.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_69f6f52768004df8a10f3bd8f2cd2a98.pdf?index=trueIn PDF document text
    • http://jinizegujez.rf.gd/bachelor_eid_bangla_natok.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/pegemiwanolejolonu.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_12caa6dfc13845c69e509aa64677e31d.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_74cc4245d8e1475a923728fe627d949e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/59629310215.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_d0cf627c20cf42c1a5edfc359a8416fc.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_0ca7e82ee44b4af7adfe6f56bc4555e1.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_f5c45bc0f5b64346a42b5a902327ae6c.pdf?index=trueIn 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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 5320 bytes
SHA-256: 45f3e78aee5c4b55ce211c0a46046c611fb5ed23ee1153a7b92fb8f3ee33081b
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 11160 bytes
SHA-256: 8139fb3fea01b3987eff44ed2ad7c4f1110e2799a2f9f8b7369f1cb78158390f

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