Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b79b90e54b1bf1…

MALICIOUS

PDF

108.2 KB Created: 2021-01-21 02:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fee7183ba1bdb36b156ddb565ca96d48 SHA-1: 7877219218a6f2ead5d54b265331e0b8d6eb144b SHA-256: a5b79b90e54b1bf182a9c46ee1924cb20e517fd7016808273166aaf0618e784c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (https://cctraff.ru/123?utm_term=mortal+kombat+kano+movie). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of multiple links suggests a phishing or scam attempt.

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://cctraff.ru/123?utm_term=mortal+kombat+kano+movie In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_5f96bba41993c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5fc6c0ec052c1.pdfIn PDF document text
    • http://nemurirewokow.iblogger.org/susuleribasitapew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5ffa30ca7df52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_5fb485e3675de.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixadamobus.epizy.com/baixar_reader_para_pc.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/bofodusamanezeje.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/lymphatic_system_diseases.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/92843055441.pdfIn PDF document text
    • http://lefanivewog.epizy.com/kadikulitejito.pdfIn PDF document text
    • http://gumusijejokezit.epizy.com/92833321134.pdfIn PDF document text
    • http://navadolaje.rf.gd/bootstrap_4_testimonial_slider_free.pdfIn PDF document text
    • http://bobujosu.epizy.com/shawn_mendes_treat_you_better_video.pdfIn PDF document text
    • http://vatimofaxemog.rf.gd/hum_altbalaji_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/15327499921.pdfIn PDF document text
    • http://mulozeraxepe.epizy.com/madok.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/game_online_audition_ayodance_free.pdfIn PDF document text
    • http://jomovexujufadi.epizy.com/waxodoluz.pdfIn PDF document text
    • http://saxogif.epizy.com/87486869753.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014d5f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14D5F 17700 bytes
SHA-256: bd32d2676c4adfdcaf6ca63ce6da62b3247caffeccab004ee9d30850f0993ef2
font_00_sfnt_off00013cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB0 4920 bytes
SHA-256: 61739c4c516c944ac4e6ee24eb300365f1ac2c6a36bda1ba8a69c24ceb768d60
font_02_sfnt_off00017d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2F 11088 bytes
SHA-256: 29a25f342f7f143d87a237cdaa2266c486dff0ccad1b53a37c7f4caf9c4fec9a

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