Malicious PDF — malware analysis report

Static analysis result for SHA-256 1598470f3ebfeff0…

MALICIOUS

PDF

73.7 KB Created: 2021-01-26 22:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 016cdc1c23984b203e2672b81390a1b9 SHA-1: 6986f17c98be8a97f16e8223d145879ef3e704ee SHA-256: 1598470f3ebfeff092ed6f4ea1b6d1ccebbe32d8e179d3157af38c2743f3f44c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing lure. The presence of ClamAV detection and ML flagging further supports its malicious nature. The document body, though obfuscated, suggests a lure related to 'campers', likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/wb?keyword=ultimate%20off%20road%20campers%20second%20hand In PDF document text
    • http://reduslim-officialsite.site/fepavedigoxogwjps.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/Ihcjehb/stone_blasting_machine.pdfIn PDF document text
    • http://frukt.fun/49513825429pymm8.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/Lhchhid/avatar_maker_cats_2_apk.pdfIn PDF document text
    • https://mokonalu.weebly.com/uploads/1/3/0/7/130739423/gilogiman_wekigal.pdfIn PDF document text
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/5abc9f.pdfIn PDF document text
    • https://cdn.sqhk.co/xubenijevewe/5r5Qics/58090702747.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/cIVhhgd/78699108052.pdfIn PDF document text
    • http://com-servers.online/lugin8r9yv.pdfIn PDF document text
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/9309680.pdfIn PDF document text
    • http://help-igcopyright.xyz/love_story_taylor_swift_lyrics_meaningdc0w5.pdfIn PDF document text
    • http://smartbright.club/buxojadukedukewuhlngw.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/hihejij/shoot_em_up_spara_o_muori_streaming_ita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeroguru/python_django_template_language.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 3044 bytes
SHA-256: 1dc3b6c7ac641a173043605a71bd6f7e109003d86a7786537494c9fc5d3e0b8b
font_01_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 5388 bytes
SHA-256: b63f8cdf66995c2aa3ca91e1a1fa990b461b6eb0226bea9e424be27b205087b7
font_02_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 11036 bytes
SHA-256: ccf8ebb1790d7bc4e48b452c24c7a12602f3b349d8b0ccfd22991f564d72d04a

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