Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c79ce132679882…

MALICIOUS

PDF

77.7 KB Created: 2021-06-06 14:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 920d231433c60eece4b0da8cda2a24a5 SHA-1: c6546046d54e18e574a7b13c7059bc282d09bf91 SHA-256: 54c79ce1326798826f3ec37109bce3f379d620e9c00c42cd0f00937ac3d1d122
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with several heuristics indicating it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=ansible+template+jinja PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467027/normal_5fc93a0948da4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5ff611117602a.pdfIn PDF document text
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/5994501.pdfIn PDF document text
    • https://buromikeraxisam.weebly.com/uploads/1/3/5/3/135323607/f79ff1308355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373504/normal_5fefde007d0cf.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/niwivotu-zilodifafof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_604d417e51e6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/75819a65-7ed2-4380-bbbf-8caf244a1355/why_should_i_go_zero_waste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f859f8b1-073d-4bef-a01d-316e36cd695b/97455380028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442c52e2-06c9-4db9-a662-c74cc6ba9970/hamilton_beach_rice_cooker_spare_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921104f0-5e7a-407d-854f-c8eae5fcabab/graphic_novels_for_kids_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a33b7a7-6260-4647-bad8-1b0309864be3/what_type_of_charger_does_a_ue_boom_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a96f5f1-aa17-4292-9536-91b903e2af5c/74465356525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15ae8a3-60f1-4914-b6f1-a0f349d732d2/are_there_any_haircut_places_open_right_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fa3cf3-5d0a-436d-9079-dbb8dacb238b/netoferazimijojufipelak.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/papabegorinarivelovol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3d0b38-da6f-4e3a-8d8a-a289c0944471/93612177050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b656ea49-596e-4229-a5a8-5ace8db57e31/24911509128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db725faa-30ae-4ba6-ab04-467708e15b95/23558776568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98cfe09-fb94-4f14-8e5e-e9c137e7d082/2912573549.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144619209/how_to_make_a_weight_loss_calendar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 4752 bytes
SHA-256: adbb19f9fa0c05ed79b481e74697c5793f59ac37f1f6b55214b6ea854337e96c
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10920 bytes
SHA-256: 441ce56bfca4f3a4ad834f5a31279b5d6f7b95e759279fdf5c130a27f62ee72d
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3