Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc653be7246837…

MALICIOUS

PDF

74.2 KB Created: 2021-06-09 04:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a50355233bda25729f4efc64f7b522dd SHA-1: 69e326c5a8fa3cc1a32f37a34701107bedaec3ea SHA-256: b5fc653be7246837fbcc6b7b5f4e1f4dcd0fe054f1655969b800d9c08d402bcc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging PDF vulnerabilities or social engineering to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/pbw?utm_term=raavanan+movie+download+1080p
    • https://bopazexujow.weebly.com/uploads/1/3/4/8/134876268/8667074.pdf
    • https://static.s123-cdn-static-d.com/uploads/4487194/normal_60b5544fe5066.pdf
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/9196100.pdf
    • https://wovogivas.weebly.com/uploads/1/3/4/0/134012667/komifotitedisa.pdf
    • https://cdn-cms.f-static.net/uploads/4493553/normal_60450b7b00bbe.pdf
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/c5832cff2356.pdf
    • https://cdn-cms.f-static.net/uploads/4482403/normal_60bff1d4e0742.pdf
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/kijide-lefiduzegebov-bifovi-jivarunolovide.pdf
    • https://cdn-cms.f-static.net/uploads/4372696/normal_600f1a9f4b219.pdf
    • https://cdn-cms.f-static.net/uploads/4415946/normal_6069fddfa71b3.pdf
    • https://korodovijexud.weebly.com/uploads/1/3/4/5/134512412/tuweba_sazajivipokava_zolepu.pdf
    • https://cdn-cms.f-static.net/uploads/4488822/normal_6017ab177d21c.pdf
    • https://gulukuse.weebly.com/uploads/1/3/2/7/132740430/7334355.pdf
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/8961426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gupiguna.pbworks.com/f/zituxudumokilumati.pdf
    • http://mibegenav.pbworks.com/f/is_hoi4_multiplayer_fun.pdf
    • http://moxulolo.pbworks.com/f/nisafabetelekilila.pdf
    • http://gawalutibig.pbworks.com/w/file/fetch/144904971/vujajudabileke.pdf
    • http://tukosifana.pbworks.com/w/file/fetch/144830094/subway_surfers_poki_london.pdf
    • http://zuwuzemoj.pbworks.com/f/dujiwapojujaje.pdf
    • http://lulatigono.pbworks.com/f/free_movavi_video_editor_14_activation_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46f.bin
857a02ec3738f80bfd4d27183c7e715038404396fc595a7ba9017a735eb3fbb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 5380 bytes
font_01_sfnt_off0000f6c8.bin
a9a7f7a214baae25e251d11c266cfac2f57a1b44b61f4202276cd9d7403aaf2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 10732 bytes

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