Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4bb32f3d95023a…

MALICIOUS

PDF

78.9 KB Created: 2021-04-22 23:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c06f98755cd3728296c3193f55a761fa SHA-1: 6d24f067d3628844da676dd305e8c04c5473e8fb SHA-256: 2c4bb32f3d95023a5b53f829d7e44898fe502acd8a29fcb3e092ae30892690ce
186 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 or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards the document's primary function being to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=will+cyberpunk+be+fixed+on+ps4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd9cb61af142.pdfIn PDF document text
    • http://jefijunanupe.sportsontheweb.net/dunuzagetesamebofogewif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5fcb5ac24834a.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://pemesekisubabas.weebly.com/uploads/1/3/4/6/134659876/d328f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_604424da1b579.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/xexukajigelogenil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_60188762d09a3.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/be402741.pdfIn PDF document text
    • http://pink-echo.club/33861652468kfgcn.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/netuvosidixedi.pdfIn PDF document text
    • http://construt.site/canon_speedlite_430ex_ii_repair_manualrh9tx.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/aeronautica_imperialis_2020.pdfIn PDF document text
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/kilifovej.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/23673812453.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/630b3c2e-4428-4bb8-9e6f-949f7c2af0b8/parrot_ck3100_bluetooth_car_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fb4ee9-14ec-405c-a745-8287387293d8/excel_vba_find_in_string.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d073c37c-edc1-45b4-8c2f-2e2ef763d9ec/what_does_causal_factor_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4eba44-a647-4ef8-8788-4ac59fa412aa/xoduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c8f2af-d1e4-4e89-912b-941e04c128e2/86837432757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d091f5dc-a3e0-4ef6-b9ea-7d7e0c0bd240/dutipujudibunajokulerak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4c9a0b-4c83-4239-a163-74d440d2e9da/can_a_rental_agreement_be_cancelled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e4e750-b914-41a9-aa81-d851fff62d48/why_do_we_measure_absorbance.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_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 5416 bytes
SHA-256: 1247dba651f4067049a76f6399c0bd4d1cae98107fb3becd17277fb4e241e53d
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 10876 bytes
SHA-256: 50c0b7e8379d09d77e2b2b700b9eb9aed7d213f0f50494a80aa60cab44bb27ae