Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1860f07eeaee58…

MALICIOUS

PDF

71.3 KB Created: 2021-01-30 09:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dd0364fb5f4434a31abb42846eb60805 SHA-1: b6e7ac428435310e207a7469feec9a65cc4b81d4 SHA-256: ff1860f07eeaee58d69c13bb461a015fe045ebf8f49e9d9f707e02f562398c0d
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 identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://cctraff.ru/wb?keyword=pac%20ball%20game In PDF document text
    • https://cdn.sqhk.co/tuwebobit/J2Vifhg/78944920430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385030/normal_6003d28d2efc9.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/STojaia/8174524745.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/ab8d4f7d1e90212.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/5c79c.pdfIn PDF document text
    • https://cdn.sqhk.co/lezubenewago/ihjchis/respect_for_freedom_speech_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_60140f7791e88.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/WZMLl9T/56914266840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_600e616c9d77c.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/papekud_fokeragejilefa.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/mlgighd/jurassic_dino_water_world.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/iejjhid/happy_birthday_sister_in_law.pdfIn PDF document text
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/65e8dfc9199.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/804d7aa.pdfIn PDF document text
    • https://cdn.sqhk.co/towojutal/fe1Hjan/yu-_gi-_oh_duel_links_download_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/bajunizigijipusigozasu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/jekolujebufobez.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/last_cloudia_reroll_guide_reddit.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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 4988 bytes
SHA-256: 8fe995bf9dc110a60c80e957b54ad9504d1c12b3a253b31a396db0ac31c7b9e1
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 10880 bytes
SHA-256: 37a7d0a59867bf7ae9b586ec8d7fb3991be3eb04e7f2266ac0344073329446e9

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