Malicious PDF — malware analysis report

Static analysis result for SHA-256 188938fa67e4bf55…

MALICIOUS

PDF

83.2 KB Created: 2021-02-22 07:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3859b5ace33fefe28208e3caeece733d SHA-1: 5297d770e746f9710c41cd6b9818d7e6cceb0c31 SHA-256: 188938fa67e4bf55702b0bea0bd4acd3ca0bf59e968a2acc468982f62df8b7f7
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm. One of the URLs, 'https://yafferge.ru/123?utm_term=the+outsider+colin+wilson+goodreads', is identified as a malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

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/123?utm_term=the+outsider+colin+wilson+goodreads In PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/2905881.pdfIn PDF document text
    • https://pabekebu.weebly.com/uploads/1/3/5/9/135990513/lidepibudobu.pdfIn PDF document text
    • http://vseti.life/rikawugerufnk0k0.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/vavoganituxob.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/negadaruguf-safet-fozav-reroreme.pdfIn PDF document text
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/wamub.pdfIn PDF document text
    • http://hookup153.site/95292207350hfcxb.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/8412991964b1dq8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disemetizoxexo.rf.gd/outlook_app_won_t_open.pdfIn PDF document text
    • http://tupaguwojisese.rf.gd/joker_board_game_template.pdfIn PDF document text
    • http://tukufewusi.epizy.com/20896010056.pdfIn PDF document text
    • http://dixuzudes.epizy.com/bread_machine_cookbook.pdfIn PDF document text
    • http://banumekopi.epizy.com/jufuvejinukumuneketazixov.pdfIn PDF document text
    • http://jolenifetonami.epizy.com/bolne_wala_lock_apps_ing.pdfIn PDF document text
    • http://laxilajolagavaj.rf.gd/atelier_801_transformice.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/wow_1._12_warlock_leveling_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off000112a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112A5 25612 bytes
SHA-256: bb6d015b2a895454b389d6c4e939596c95566ba2d61530e36b0bb75d6e8dc939
font_00_sfnt_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 5240 bytes
SHA-256: 2ce387e7070e1daeb056164e90b6e28c415051c1939dcc65f5c466a9f7e0ed7a
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 10632 bytes
SHA-256: 30bc5943575942e8ee10c928a571ef14c2d58944423cd9f4ce51503cd0fe8ddb

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