Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c698be4b8113194…

MALICIOUS

PDF

82.3 KB Created: 2021-04-01 09:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd9fd4877540a9ea9147500c10f61c61 SHA-1: be08c578d5b78859837824dbba3494ec6b2ea88f SHA-256: 2c698be4b81131941580c4acb3f324e8eb270c223497d81d115435fd4d5d0048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=pyramid+of+numbers
    • http://yblda.fun/concept_of_improvisation_of_instructional_materials0rtdx.pdf
    • http://nuvotana.22web.org/13822669950.pdf
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/05982abb97c70.pdf
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/4076663.pdf
    • http://mosilewuzofivan.iblogger.org/zarulogilan.pdf
    • http://salonly.xyz/what_do_med_schools_look_for_in_recommendation_lettersbjch3.pdf
    • https://xotizirew.weebly.com/uploads/1/3/1/8/131855992/610ac0cd7e6.pdf
    • http://vulemese.iblogger.org/how_much_water_to_add_to_orange_juice_concentrate.pdf
    • http://memokepudag.iblogger.org/princpios_de_administrao_financeira_gitman.pdf
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/kepar_zutazunefasi_rukiratiniba_wiwufomigurawi.pdf
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/139dfb95a30f.pdf
    • http://fishing-rods2.club/how_to_use_rowenta_pro_iron_steam_stationa7c1q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_b5f2cdb51242491fb5706cd7f95abf4f.pdf?index=true
    • http://gebuzabode.epizy.com/champion_junior_clothing_size_guide.pdf
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_460ff5081a634ac9a1c70cb5bb84af77.pdf?index=true
    • http://buzabokinoka.epizy.com/13039685932.pdf
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_994b3432e5af48968b645864835284f4.pdf?index=true
    • http://gabepan.epizy.com/la_casa_vacia_algernon_blackwood.pdf
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_ab71797b0d74415d85688b89ff3d894f.pdf?index=true
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_5fa3ac4e86fc4c1287f1d915d53279e7.pdf?index=true
    • http://gagisejokunego.rf.gd/xodekujovubuzatugizivi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f625.bin
ce6ca738bf2e2a002b542b75ab4e1a574fcd8da10a01e23d307dd30e021ec63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 5068 bytes
font_01_sfnt_off0001073a.bin
443965f0380b697abb034174abb5fb578a3a9974c4dbeb0501d97914d0ff02a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 11556 bytes
font_02_sfnt_off00012e11.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 4324 bytes

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