Malicious PDF — malware analysis report

Static analysis result for SHA-256 3912ec573fb920ce…

MALICIOUS

PDF

76.9 KB Created: 2021-05-22 03:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 381b0e70071b7de1bfbcf3699378b205 SHA-1: 29ca36b9674f3848eec9bb94387b2cb7496a2739 SHA-256: 3912ec573fb920ce8c42cb2654e10c7217ba9cdbe57a79ce490513debaf270c4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=pokemon+emerald+battle+frontier+rom PDF link annotation
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/neratalemet.pdfIn PDF document text
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/7b9c77c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404297/normal_5fff1313773dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_60263eb08e6d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_603e87f00d90f.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/7714560.pdfIn PDF document text
    • https://budafamilefa.weebly.com/uploads/1/3/1/4/131452884/robuvidife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_60372474149e1.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/betarogajowop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_6032d5da395e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_605032f07941a.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/7633372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_606968cd57bc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe01c49-7b0f-4ccc-a774-e2ea25747500/five_nights_at_freddys_game_download_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/desavabalidupeputefuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5320b295-e684-4ad3-9199-01dee29a7fd1/tikagoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/potaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/history_of_english_language_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec32c6a1-46e3-4744-a8a8-9aa278f85365/carl_jung_personality_theory_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a0f4fe-f340-4fa1-b893-3820972f76bb/can_you_have_multiple_wives_in_sims_4.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/google_apps_admin_console_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c271389-3c00-41db-af82-b1d4b575cdfc/98120739756.pdfIn 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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 5080 bytes
SHA-256: 7d92e7293142b1f35c4641806f9f614c23f6b66b7093c415276d80ee30644260
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 11164 bytes
SHA-256: a9e451f362d6552d3736d5226fcb442ab8d83710213c658d54373fcedf832a09