Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f5c252dfa8dd04…

MALICIOUS

PDF

75.1 KB Created: 2021-03-10 10:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dc6e1a7540e703a414a1d7f7c636c6f SHA-1: 8f5312bb7d11b2c12f08ae8ed2daaccf0c2a04cb SHA-256: b6f5c252dfa8dd04f32300ca2570f7e8a011aa3ad90d64b17bff2366edb2278e
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many of which point to other PDFs, suggesting a phishing or SEO spam campaign. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wix?keyword=pandora+mod+apk+6.0
    • http://haifaiv.ru/mogumoniradixono7bo12.pdf
    • http://vashe-zdorovie.xyz/govafexajevonadewikixari1dkmv.pdf
    • http://gadatoreneperil.mygamesonline.org/rokuwe.pdf
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/3070619.pdf
    • http://velesvoyage.ru/learn_russian_podcast_redditkr93h.pdf
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/eab55569.pdf
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/vuleg-xumusagiredu-wijeruzovutepa-kizavol.pdf
    • http://boldly-grow.com/82053730236kt5up.pdf
    • http://bijepitujutix.sportsontheweb.net/how_to_pair_plantronics_savi_headset_to_base.pdf
    • http://remontnatali.ru/7316168343ph3k0.pdf
    • http://tekplafond.xyz/python_list_comprehension_remove_first_elementgordm.pdf
    • http://lnstagramverifiedbadgeservice.com/attack_on_titan_game_pc_onlinev67wr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_55f81254da6846329ebffa3df15e4742.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_9ec8c77254aa4317ad1583d01fb70d94.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_0c539fb493ea4e8f805c096c9beb92a2.pdf?index=true
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_d88e7590820e40e69110c52e2f8b274c.pdf?index=true
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_f08faded776f472a9176ae7561ef360e.pdf?index=true
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_6cf43ebd8b5547fe96c1efb6501e6c82.pdf?index=true
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_b516fdc24e8e454396b7224add75f186.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_1af1b916c7964fb59b6b2783ae54aa2e.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_e0bf1cba9c584b54bd24b176379be204.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_off0000eb49.bin
3b0d5b5c56606fd2918c61266df0a4e41cab3dc3a5cef1ab70704208ccb169d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 5288 bytes
font_01_sfnt_off0000fd38.bin
a8a8fc4325b3ae7561a5a11eb9611418d90c77c82d4efe174c39f2f0e2ce1242		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10040 bytes

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