Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aca97631c3a909b…

MALICIOUS

PDF

65.9 KB Created: 2020-12-31 21:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6921cec103ea2263c647c638a2ac7ba5 SHA-1: d4645914d57e2129d4e0e3071f097fcf99e667ce SHA-256: 6aca97631c3a909b08cf9cbd7f6e40176d1fad501acb4cc955e0db4f46088787
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate that the document's primary purpose is to redirect users to other sites, potentially for malicious purposes such as malware distribution or credential harvesting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffine.ru/123?utm_term=dad+n+me+unblocked+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5faab9a9b9932.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/wubuka_gukasad_zateraminibeze_ladepinugoge.pdfIn PDF document text
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/lerudunamonesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5fda6f847480a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5febda74b5aab.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/gupofe.pdfIn PDF document text
    • https://wuwepila.weebly.com/uploads/1/3/4/3/134371533/vopup.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/nosazewagok_ximefijigo_tibenij_gonewozawovev.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/fb8f4650-e3cd-4fbd-9d51-289e1dd664be/mac_os_sierra_iso_image_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07adeeb2-947b-4347-b875-334269182966/91931602079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6764ed27-a8b4-43e0-b2ee-d240c70186fd/72193144866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f839c6-9ab5-4b7b-8a1e-08e0c8d59cf0/vasurabodipazaguzed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccef9835-cd6c-4bf0-bfcd-567b4491c25e/weber_beer_can_chicken_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8db5a3-d1b6-45f0-abfb-048141fe0d36/88801818872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bfacdd-7fb0-413d-8daa-09315405a175/the_mystic_path_to_cosmic_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81a6591-5ffa-4b55-b2b6-22b334e5b680/41170193941.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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 5364 bytes
SHA-256: 99ddcb4651773e79e7e835a087fa8e34fdaa82b1f2da1ea56d8dae2ea23de883
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10760 bytes
SHA-256: 28fe3292a29c5dc821c700bdac2b87c7b7aa66b05271dc67970781fbc5287496