Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b454a6e36a92266…

MALICIOUS

PDF

76.4 KB Created: 2021-01-23 23:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5dc661535834e267b7a9db5690aeb5f9 SHA-1: b2c88d11e9e57d7e1ff0494a6919615813e48f13 SHA-256: 7b454a6e36a922666594c4b1199857c9687299d9a04b3cce7ca653d7f4a7c5f2
184 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors, pointing to infrastructure known for distributing malware. The document's structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as an attachment. No scripts were extracted, and the document body was heavily obfuscated, making a precise determination of the payload difficult.

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/123?utm_term=how+do+they+make+ethernet+cables In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385197/normal_5fff3cff9e431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fc946b2648a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5fec88c3a1d55.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/monster_merge_king_hack.pdfIn PDF document text
    • https://site-1257572.mozfiles.com/files/1257572/vusasojirotajawofep.pdfIn PDF document text
    • https://site-1178226.mozfiles.com/files/1178226/joteru.pdfIn PDF document text
    • http://mananeje.66ghz.com/mirut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_5fdc500fddc2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatosizukav.epizy.com/zokanetubaxapewamefazipoj.pdfIn PDF document text
    • http://vabagez.rf.gd/wow_classic_leveling_guide_alliance_warrior.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/android_developer_get_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/rpg_maker_vx_ace_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/ara_ra_ra_khatarnak_marathi_song.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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 5540 bytes
SHA-256: 5842fa44d166e7aeddc73aebefd96047ebdead42f9ec1f7ba31e94559dd26564
font_01_sfnt_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 10240 bytes
SHA-256: 35f889574d423cdbfcdcac345c604333bbe8df8e26f54e197d07b01f17b4e308

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