Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff7fe3ae204cf50…

MALICIOUS

PDF

100.0 KB Created: 2021-04-05 13:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 372bf33ece99b49606fb38053cd52f45 SHA-1: 019d2aae1d487b9e37e7b41610c8da98a81e72da SHA-256: 5ff7fe3ae204cf5054f50d9593cce41bd85ca8975193b78761b5f12d5c96c077
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspected phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=the+righteous+mind+chapter+3+summary
    • https://cdn.sqhk.co/nudadubuju/KVsMbha/pazenotis.pdf
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fedf1de30c42.pdf
    • http://lnstagramverifiedbadgeservice.com/msi_970a-g43_cpu_cooler8u3uu.pdf
    • https://static.s123-cdn-static.com/uploads/4382960/normal_6003a7d62752f.pdf
    • https://cdn.sqhk.co/fekurisakez/uUricgd/43682938816.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fcbb953987bc.pdf
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60366d2a6768c.pdf
    • http://lofitner.buzz/tolebuhh0u6.pdf
    • https://cdn.sqhk.co/noneniwetav/ZEXaibg/48329081865.pdf
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fcc98e260fd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_1e1175912bc54bb490239a0281dc2b62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6052d4d0-b1a8-4516-be70-6ca7cdd7306e/why_is_my_rv_fridge_not_cooling.pdf
    • https://uploads.strikinglycdn.com/files/f4f37c05-f818-4cbc-aab8-2c2b7fed1c9e/lutevukizijokan.pdf
    • https://uploads.strikinglycdn.com/files/7eb43f68-5bed-451d-bd17-b66eec57a6c7/easy_vegan_gluten_free_christmas_cookies.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_1f2e5c9f043143afbdc2305e2be640b5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/320fb602-7e4b-4e62-9406-ea50515a836f/que_significa_cuando_se_cae_un_portaretrato.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_284fd9340ea947b192f9fe854387b8da.pdf?index=true
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_a32b96a82869484ea3b6e0a97f1d857f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9da2167c-a214-4b60-a1c8-309e28cc7bad/how_to_change_the_time_on_a_techno_pave_watch.pdf
    • https://uploads.strikinglycdn.com/files/f9af5091-656c-42c5-be16-75114f92cebf/54384292885.pdf
    • https://uploads.strikinglycdn.com/files/9c33b5a5-fb37-49e3-b292-79890da8db86/majonivujadosuwelap.pdf
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_3680a86e33cc443cb124cc99a9317f6d.pdf?index=true
    • 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_off000149f2.bin
5e66ad69e7b64c1441eef85d3b2f12fbc482403c06370167de1b980b599097cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 5668 bytes
font_01_sfnt_off00015d19.bin
f6002e25646b36a2113011d05db0362a5a6bf8d18d609f8858ca9a5fc08715a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D19 11012 bytes

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