Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3e2c57ff5b64b4…

MALICIOUS

PDF

74.9 KB Created: 2021-06-13 20:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a8151691f9eb66d1186b4a4baa768ddd SHA-1: 569925a018cf8eac14eaccedb2824f52880a817d SHA-256: cd3e2c57ff5b64b4696284ce8f8c265905ffbe8b977aa67ff802e1c604d4f9b7
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as a game emulator. No scripts were extracted, but the PDF structure itself is used to host the malicious redirection links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://crewmak.ru/pbw?utm_term=play+free+fire+best+emulator PDF link annotation
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/4487245.pdfIn PDF document text
    • https://divigutokorafo.weebly.com/uploads/1/3/4/6/134683056/8699417.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/6684811.pdfIn PDF document text
    • https://domuvajedoxu.weebly.com/uploads/1/3/4/8/134847007/pifidilug.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/kenewapobizepetoluja.pdfIn PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/gabidaxitovevadexejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ff1c143de98f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5fd3454082570.pdfIn PDF document text
    • https://juxepikipoz.weebly.com/uploads/1/3/4/4/134486641/3381937.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4405925/normal_60afe7dc5baa3.pdfIn PDF document text
    • https://firajapototirop.weebly.com/uploads/1/3/1/4/131452771/7684950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_6025cf3824363.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/jibojabaxixeji.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/c52ad1c2-c8a9-4ffd-aedc-6899c5ea237b/7989817327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e77d362-84a7-4fdc-adcc-06fa654ef679/lekiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383128d2-27bc-4194-b0a2-e5856cd41d4e/why_is_zappos_a_great_place_to_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9de97a9-95eb-406d-8fa0-55101a272974/gedonukefikigagugadok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8767e06c-75ca-4c32-b4cf-96671774802c/como_agua_para_chocolate_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42649a0f-7dd0-440a-9499-be2f2ba5cef1/623945196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026b0106-c337-480e-a1b1-3775909f750f/lavavokiwogufugenut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef2399f-cce7-416d-b1f8-8084e6cb796a/jopekutobifojosewasozo.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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 5156 bytes
SHA-256: 2360e49dc464f97dff204e19f7f262e4fdb615fad60b8a26d7638ce1e6e45e05
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10932 bytes
SHA-256: 0121f62921635fa2c069c66c2165ab46189f0c551c19e1a6b95cdc868e9287b2