Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e86ab8b25f123…

MALICIOUS

PDF

77.8 KB Created: 2021-05-30 00:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d3a00ca7739a6808f3e9373919cf35a2 SHA-1: 2b9f591085de25b229c4ab4af5fae2dfccbd554c SHA-256: f51e86ab8b25f123be51ade8fb67245c51f87fb3325a3df34a7276bbd88f46e6
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing lure. The primary URL, 'https://xezojetit.ru/strik?utm_term=clocks+coldplay+easy+piano+sheet+music+free', is identified as an SEO redirector for free downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/strik?utm_term=clocks+coldplay+easy+piano+sheet+music+free PDF link annotation
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/89a91b1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445104/normal_5ff3614722162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_6003f7cecf4a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_60388a55f04dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476780/normal_5ff42181289b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_606437bdd5f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fea40bf70823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_6060c004d3434.pdfIn PDF document text
    • https://rinosebamajipem.weebly.com/uploads/1/3/4/6/134694393/a580b26babeec6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376621/normal_600758e0196ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_6052d0617aff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5ff17fcb443d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b4a536-f4aa-4c9d-9670-676e3e2f13b2/50228229868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6989b34-9126-4354-8b35-5b6f22d458af/dovifemegituxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53afbb7-f9d2-4f50-9ea2-f1bb0d8678c1/bosch_axxis_washer_error_code_f43.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75e1c24-e1ad-466e-b565-80fbb8722e77/fobinajozapojonarezejof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e7f8fc-7fe8-432e-81ed-7129f33b7b53/bujadupasaneforujamopir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbf0850-3832-42ac-bb35-8b3a90181dc1/vodiloporikotexakuxavub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9527d538-4eea-40ec-accb-fa1803a037c5/69972004350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5106fa2a-0bfb-4cb4-992d-9f8904d22739/best_mini_audio_system_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 5464 bytes
SHA-256: 23f11f015ac3ee82fcaee6d819cb9a9e15b7b18ce1f4a9728f9f8a2172ae7b4b
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 11180 bytes
SHA-256: 026100ba59693cbd13633526835291350c636314599c7ab98b19de05da3f3787