Malicious PDF — malware analysis report

Static analysis result for SHA-256 180712c3f8411ee5…

MALICIOUS

PDF

73.1 KB Created: 2021-03-04 09:17:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0111ddcfb140d5ce5bb07ef9af3c73e6 SHA-1: e04905baa1c80e3b7cab3363ea7ec4e5b7f4f2d8 SHA-256: 180712c3f8411ee58358bf183d764f5f450f6e1d19a6ccfd7ab4af8285ca6721
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with URLs like https://nipisod.ru/strik?utm_term=c%2523+.net+framework+tutorial+pdf being prominent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to malicious sites for further exploitation or credential harvesting.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=c%2523+.net+framework+tutorial+pdf PDF link annotation
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/5983534.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/sejulotuwekob.pdfIn PDF document text
    • https://cdn.sqhk.co/ninafoso/gEhdgxq/world_series_champs_2019_gear.pdfIn PDF document text
    • http://nulatapukedu.scienceontheweb.net/what_is_true_of_the_fruit_of_the_poisonous_tree_doctrine.pdfIn PDF document text
    • https://pasikozadiru.weebly.com/uploads/1/3/1/3/131384374/6382785.pdfIn PDF document text
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/8b84038b.pdfIn PDF document text
    • https://mutudibekakifu.weebly.com/uploads/1/3/1/3/131398274/7066323.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/gtAheid/stachys_byzantina_silver_carpet_seeds.pdfIn PDF document text
    • https://cdn.sqhk.co/miwurazaz/shedVlG/human_life_protection_act_2019.pdfIn PDF document text
    • http://mapimiz.22web.org/barbie_princess_charm_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezuvemun.rf.gd/9388708969.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/what_is_grounding_in_counselling.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/mebuvunidu.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/lomonipowusilad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 4064 bytes
SHA-256: 3ca9e608e787ef4d065a8bd80c74021054e6b6ceb23908d20c89b2ad1b5fbe25
font_01_sfnt_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 13284 bytes
SHA-256: 377ee32298de97eb127d6ddf59dcf058450f30a9571d9d73a277d815fa450247
font_02_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 16212 bytes
SHA-256: 6b8bd818e551981ecf9c1c01d2924c22bd87430aadbba0867e22f67ed3a4a9c4

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