Malicious PDF — malware analysis report

Static analysis result for SHA-256 9156b6988b2d3bb9…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 16:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d43fddc5e9edac655bf35fc0bee69bf4 SHA-1: bfdd83d4350d028e06035a306aefe23bdb3b81a4 SHA-256: 9156b6988b2d3bb9bb098c64a1ccc98c2fb4b68adb07831482aa86694f43d08b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malicious content distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/wix?keyword=rogers+nickel+silver+spoon+value
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fde02cc0568b.pdf
    • http://tagaporigowekis.mygamesonline.org/10597687269.pdf
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/8812403.pdf
    • http://bagomebefekixob.getenjoyment.net/21977066127.pdf
    • https://cdn-cms.f-static.net/uploads/4418385/normal_600dc4bb75618.pdf
    • https://mirodogewe.weebly.com/uploads/1/3/4/8/134861862/2111689.pdf
    • http://konolux.medianewsonline.com/muxurininud.pdf
    • http://rakapugijumub.sportsontheweb.net/gomazekugom.pdf
    • https://duzozerijadid.weebly.com/uploads/1/3/4/4/134493401/6594457.pdf
    • http://wupemokabate.scienceontheweb.net/kufifuzatafisij.pdf
    • https://cdn-cms.f-static.net/uploads/4469143/normal_6040be1e5788f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_45c0b14776fc457fbaaa542ff074abe8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f684158f-ed48-4c9b-93f8-618b92242e2d/dimijedapivogujifewobaz.pdf
    • https://uploads.strikinglycdn.com/files/1841552a-1cc3-4496-ac4c-63ae2c38e6f9/waxowemuxogilize.pdf
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_2f89778e2bb34e3dad4a6faa6152731b.pdf?index=true
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_a17bef1ca7974575a2ed4af2734f721d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/246e100a-75dd-4f70-b9de-687cad757ed2/what_is_covid_protocol_nba.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_0f91f275e8d84e9297791abbfdeb614d.pdf?index=true
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_0ff7c7994a6643b5849c64a13f062c83.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_31502bd6145f47b9a6cfff24a4a6152f.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_ce13158828f245e7a25b89ee2f36f462.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7646729c-6e45-4414-8909-29e3c6f94f28/intermec_pm4i_label_printer_manual.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_baa98e43273c4b59b5da8c010bead62e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e1ad3ae-c563-49cf-a5cb-44b85582761c/2005_chevy_malibu_starter_solenoid.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_off0000ec7b.bin
1e8275514277b556deb44bc77b4d6e3fe70a1358b5e810b32fb31c4867f8ab2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 5232 bytes
font_01_sfnt_off0000fe71.bin
6c1d862ff48e893b6086e493478433042649ab54abcb13d6f790aae839826613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 12216 bytes

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