Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b442d9d24b6b21…

MALICIOUS

PDF

75.5 KB Created: 2021-05-11 15:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b9806e688166151357efc9e305a10ca5 SHA-1: 2b6be98d7c81c7c40863d8e15cd778676fd9eca3 SHA-256: c5b442d9d24b6b21ec7d6b7bad642498e0ea63f3f981cc2974380dfe4ffbc1ab
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a common technical query, likely intended to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=why+is+my+portable+ac+not+blowing+cold+air PDF link annotation
    • http://lamaded.mywebcommunity.org/nudibunixowurogevikubu.pdfIn PDF document text
    • https://mijeridofuba.weebly.com/uploads/1/3/4/6/134677835/4126494.pdfIn PDF document text
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/livuf.pdfIn PDF document text
    • https://zelejipez.weebly.com/uploads/1/3/4/3/134353750/423b53373ca6b.pdfIn PDF document text
    • https://mijawogutudegi.weebly.com/uploads/1/3/4/3/134374589/e875581259f106a.pdfIn PDF document text
    • https://felixitu.weebly.com/uploads/1/3/4/0/134012625/pejimaxovilofejibe.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/who_sexiest_man_alive.pdfIn PDF document text
    • https://wekowegalovu.weebly.com/uploads/1/3/4/6/134668649/1fec23faf8f0e.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/Jhj6gfT/7906355207.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/disomat_opus_calibration_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jizesusaxeta/fiiijjb/basket_throw_blanket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_bfff6f4561424f50b37637ca7a7f4bb7.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_2a52238bbd95439aa123e1b5a029cf15.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_b2d9daa83a8f454999e611348342a445.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_4c54b2248bff48f9945771b0df417763.pdf?index=trueIn PDF document text
    • http://jojulupijawide.onlinewebshop.net/elementary_book_report_template.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_8b3758f4f10946acab8cd71fe8ccf985.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_b6cac3c7b35540478f04e86e49951f48.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_b64a86f0732d4946862274ec53443d66.pdf?index=trueIn 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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5832 bytes
SHA-256: 2559009b759d417c49eaa8c06c55d74960ca81825d513addc7f86435d9620350
font_01_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 11536 bytes
SHA-256: 154882196fff9fc71f8ee2a641aac883f3155e9477e20e57f4e28a92ed31383c

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