Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c224de53d917041…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 09:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f901bf3f66120d99a6f96eafae188466 SHA-1: b1cd9d6c8762e2f57ebc405cb301b64b79cadcaa SHA-256: 8c224de53d9170411a4b847cd2af7aee9ca845c7d17e4c6728aa985f4af7fc21
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL being https://pelibifir.ru/strik?utm_term=is+the+witcher+3+like+game+of+thrones. The presence of a link farm suggests an attempt to direct users to potentially harmful content or phishing sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=is+the+witcher+3+like+game+of+thrones
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6019d6403830e.pdf
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5fe15f955cc91.pdf
    • https://jikujumek.weebly.com/uploads/1/3/5/3/135318263/380065.pdf
    • http://femuxeririta.mygamesonline.org/how_to_watch_global_news_on_apple_tv.pdf
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/xeluv.pdf
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5fd95717c1e14.pdf
    • http://jenewazajasazu.getenjoyment.net/puwof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_0d2f02fa5dba48b8a0e00368b8f533b2.pdf?index=true
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_495f2b3d543e49eb8d632048ffcd441a.pdf?index=true
    • https://s3.amazonaws.com/mosezavor/jidusosab.pdf
    • http://vewawisu.onlinewebshop.net/modalidades_del_acto_administrativo_peru.pdf
    • http://niselekotoz.myartsonline.com/54133531793.pdf
    • https://s3.amazonaws.com/sogovekevi/8057380392.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6892985d5ebe44e1b526add8c5b51226.pdf?index=true
    • https://s3.amazonaws.com/nuxomigo/juvakiruz.pdf
    • https://uploads.strikinglycdn.com/files/06b833cd-e7fd-4ddd-9bb4-18b9771c15ae/3d_face_mask_sewing_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/2d8fee65-a663-4010-934e-d4e06cd3bd49/what_is_the_tone_of_the_poem_the_world_is_too_much_with_us.pdf
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_70773a11d70046479bea8a7bfeb8248a.pdf?index=true
    • https://s3.amazonaws.com/sezewu/remepezufedero.pdf
    • https://uploads.strikinglycdn.com/files/e9f4f2d7-718c-4f22-8b1e-0820003413e6/sopuforotozoduniw.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_off0000eee0.bin
2929f44329ae47bb39e7c840a0cc181fd933b450cd891bee309cb278e1724516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 5552 bytes
font_01_sfnt_off000101b2.bin
50caee5476a04a91aa092f5a3809b6952f6792704d2b12083e9c21a58d41a83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 10768 bytes

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