Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9a39abfefae7d6…

MALICIOUS

PDF

65.5 KB Created: 2021-02-23 00:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ffea2887c4ad0872d7101590505703f2 SHA-1: 1ba40555e2716dbd3e1edc649c20f4f740b72ae7 SHA-256: 0c9a39abfefae7d642f8e07e29fdc22f22025d65429ba1d0ce64a8b00a49d027
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic firing identified a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan, suggesting a malicious intent behind the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=the+norton+anthology+of+world+literature+3rd+edition+pdf+free In PDF document text
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/a7ed9.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/somunit-ritufekix-debura-betemuro.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/rixuwowegivuf.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/zatimatoxaniz.pdfIn PDF document text
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/romatemubaf.pdfIn PDF document text
    • http://istlan.fun/how_to_file_a_motion_to_set_aside_a_default_judgementv5u38.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/mekakazafugu7lsbk.pdfIn PDF document text
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/fovelabokazipam-juzenariv-tuvidujob-visikije.pdfIn PDF document text
    • http://sofoviwov.iblogger.org/dudura.pdfIn PDF document text
    • http://tenegijo.iblogger.org/kerboodle_answers_science_ocr.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/arua_chaula_duba_new_song.pdfIn PDF document text
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/xijuwamavopu_rapasogojazugu_gepinajotaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xifedesekelogu.epizy.com/browsec_vpn_for_mac.pdfIn PDF document text
    • http://varunogozanog.rf.gd/blue_stack_software_for_pc.pdfIn PDF document text
    • http://vewajelawukos.rf.gd/pejala.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71C 5316 bytes
SHA-256: b60fb2fe0d7d0c423669a8043529288faae934ca457ff20b556a4da50e0b57ed
font_01_sfnt_off0000c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 9740 bytes
SHA-256: 09ad4a66f32e91e55bc4ab477a439ea2acab42222f642fad2c5758a7654e0fda
font_02_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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