Malicious PDF — malware analysis report

Static analysis result for SHA-256 844ec1fe293d8a40…

MALICIOUS

PDF

92.0 KB Created: 2021-05-22 07:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 52ac8c1ea9419d4ec64adbbb0634c81e SHA-1: a59bae706ef7bd4ec936ac47811c454ba21af83e SHA-256: 844ec1fe293d8a4082b27891ebbc8c61a8b93a1ae8c45d243b6a0c80a492dc6c
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=the+mortal+instruments+city+of+ashes+film PDF link annotation
    • https://xowuwipasek.weebly.com/uploads/1/3/4/3/134310121/7520895.pdfIn PDF document text
    • https://vexikolilugurud.weebly.com/uploads/1/3/1/3/131379290/rofove_pekakedadojizaz_migopetilagitol_wuzegunagan.pdfIn PDF document text
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/6606530.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/jafavuzojitis.pdfIn PDF document text
    • https://dadomirizetuso.weebly.com/uploads/1/3/4/8/134870225/3348413.pdfIn PDF document text
    • https://keguvetazako.weebly.com/uploads/1/3/4/7/134702613/2d49510.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/sojaditunuruw.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/zimebetaxekoju.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/6895670.pdfIn PDF document text
    • https://navaraze.weebly.com/uploads/1/3/4/6/134682655/556e1eb61e7.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/6f182bc1f98.pdfIn PDF document text
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/7352030.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/lanabenavafox.pdfIn PDF document text
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/sixesakige-bimubugovek-mawan-bilexexipok.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/47c1b122-50d4-47f7-9e9e-eea49b1c7a3c/how_to_test_a_dogs_temperament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759b9785-47cd-46d9-8e40-0cc56e549085/55066801283.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/faduxowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b84347-270e-42a4-ba4c-bbf612add031/libro_el_poder_del_pensamiento_positivo_norman_vincent_peale.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/fanesonugegulujuluk.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_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 5056 bytes
SHA-256: 11977921b2b9328076495d50ba2b4c68ecb09ddd880f3f62d5683326f0b33403
font_01_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 11108 bytes
SHA-256: 781d6de26df930453a89385528b3ae50057c441612395c58c83760bda628a780
font_02_sfnt_off00015492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15492 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3