Malicious PDF — malware analysis report

Static analysis result for SHA-256 5396b35a303f93fd…

MALICIOUS

PDF

78.7 KB Created: 2021-05-10 22:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3d0f4a0307ea0b8e66cdf69a81ec139c SHA-1: dd7eb99ee9128c222de05ce305944ad362516c44 SHA-256: 5396b35a303f93fdd2a2b78fb7972cdb31f3ffd3ae676f1ad6971b39308c68f9
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a large link farm. The ML classifier also assigned a very high probability of maliciousness. The embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/strik?utm_term=enterprise+data+warehouse+meaning In PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/dokugimuwuloru-jemasivanirax-kunugokuwosulu.pdfIn PDF document text
    • https://bupiwiwokegiju.weebly.com/uploads/1/3/4/5/134598777/5780874.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/vampire_slayer_quest_osrs_quick_guide.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/kegifug.pdfIn PDF document text
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/44c6f46d1784f.pdfIn PDF document text
    • http://mobile-media.moscow/wedaxixumobarapasstq5x.pdfIn PDF document text
    • http://golomashvanna.xyz/sovigowomf6kpz.pdfIn PDF document text
    • http://chatik85939775.fun/shark_navigator_lift_away_pro_how_to_clean9jdyv.pdfIn PDF document text
    • http://dunotap.iblogger.org/laws_of_exponents_questions_with_answers.pdfIn PDF document text
    • https://faxusonugavipil.weebly.com/uploads/1/3/4/7/134741565/7437558.pdfIn PDF document text
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/gofesekaberuxopoko.pdfIn PDF document text
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/a01ca34ac1.pdfIn PDF document text
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/9431541.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/c3c092a9-6fa5-4468-af0c-9d36ac9ac034/tajofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58363954-0d68-426d-88a5-f5623701921a/how_to_program_a_logitech_harmony_650_remote.pdfIn PDF document text
    • http://gatanugirax.rf.gd/gokanetozuxofafilatafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0769de-5480-4c49-bc54-055d1d60ec06/does_apple_still_support_ipod_touch_5th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0f0b46-5a3c-47d6-a78d-6cb6af89b64f/70542372419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d19dad4-3dc2-4412-bdf4-f367bd0eaaa4/how_much_does_it_cost_to_build_a_doghouse.pdfIn PDF document text
    • http://kopozeluzel.epizy.com/jokesasibenewedonezaziza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8fa8f4-d05d-4c1d-aa58-bbb137ace2d9/pepezobanavov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eff9ae1-7ff5-4442-916a-450ca88113d1/97511257037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cc91d2-c488-487e-a964-51c8bba69665/22119107696.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_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 5388 bytes
SHA-256: a31eda9d314be49535ca154b24cad8eee982da618d07712f4eaa3f3f8b476dc8
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10460 bytes
SHA-256: 7951dc020017ae1ae1e35bb793d40248f5e68505bafebcd65c335f40e35036df

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