Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd1e30beab72169…

MALICIOUS

PDF

79.2 KB Created: 2021-02-27 03:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d7a57e1588544350a8320a111b5708b3 SHA-1: fcad90d6dbf29a8a18b172516f664d57b89bffee SHA-256: 2cd1e30beab721698e72c0d061d235ba4eec596b4b4991e8c5b30cecd1983c16
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/aws?utm_term=best+exercises+for+back+fat+without+equipment PDF link annotation
    • https://cdn.sqhk.co/vuvupewog/1lbbicq/candy_jumper_cool_math_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489725/normal_5ff1b64af23d7.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/how_to_disable_viper_car_alarm_without_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/nikazurokuv/iciegfD/globe_at_home_prepaid_wifi_antenna.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/the_postman_always_rings_twice_chapter_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5fcc01a027fe4.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/kujijoxegebag.pdfIn PDF document text
    • https://zirovosenes.weebly.com/uploads/1/3/4/3/134316706/7582308.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/Wiigfig/jolteon_build_a_bear_card.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/Ngcijis/fleet_combat_training_center_atlantic.pdfIn PDF document text
    • https://kujazekomoduni.weebly.com/uploads/1/3/5/3/135315250/filosufub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_5fe7387a69104.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/X7jdbqZ/stupid_zombies_3_day_54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 5760 bytes
SHA-256: 09c252348c7ca78c7faa35555767e7bc72cd8d53417b6d983f6c7db602c0230c
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10732 bytes
SHA-256: c409434f0bfbfbb0f7ae0058bf99b5eb81ed20d46b9aa9d56fbd3240f877e8c1

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