Malicious PDF — malware analysis report

Static analysis result for SHA-256 66653c8a29d03e04…

MALICIOUS

PDF

84.7 KB Created: 2021-06-01 02:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 258400c03b75d9c61646eacd55a5d3e2 SHA-1: bf72842793653924c9c4bb324f1ae3f2546ab919 SHA-256: 66653c8a29d03e04050d58f94d2a4721a057101688680ca09447ede9c2671766
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to employee schedules, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/pbw?utm_term=how+to+make+a+employee+schedule+template PDF link annotation
    • https://depemazijibibo.weebly.com/uploads/1/3/4/8/134846300/aecd64953c6d8.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/5608177.pdfIn PDF document text
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/ridiwari.pdfIn PDF document text
    • https://zexamaginususu.weebly.com/uploads/1/3/4/6/134686515/cb2c59.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/2222030.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/d5bccb51002.pdfIn PDF document text
    • https://vubibawijov.weebly.com/uploads/1/3/0/7/130776162/f1833b.pdfIn PDF document text
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/7228994.pdfIn PDF document text
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/rosumamasid.pdfIn PDF document text
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/bofopu.pdfIn PDF document text
    • https://lababober.weebly.com/uploads/1/3/5/3/135329518/vibezapopuvakafegu.pdfIn PDF document text
    • https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/panixixisuba-sudigupebom-pipelo.pdfIn PDF document text
    • https://dokalifuli.weebly.com/uploads/1/3/4/0/134096730/tenedoxoduriwumodito.pdfIn PDF document text
    • https://xotinibawilufo.weebly.com/uploads/1/3/1/4/131437660/e544b1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikasamu.pbworks.com/f/vixiwiropagawuwuwitonizuk.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/92200250007.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/jijevaxiwukamugosipame.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/sheep_brain_labeled_answer_key.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/w/file/fetch/144426615/plantronics_voyager_3200_manual.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144426753/what_ink_does_epson_artisan_1430_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d913d92b-4e74-4819-bf4e-6d3f44bb60e1/stickman_warriors_gift_codes_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b48e92e-c823-412e-8e9b-c32a7d5feb1e/lozisenubuwupasufamukomoz.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/how_many_days_uscis_take_to_send_approval_notice.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144433461/dagepovigilovagobijuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d47df0-7f20-44c3-a836-998a4805c538/totosikavakagos.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_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 5436 bytes
SHA-256: e739815059a80a6eefbb3e943794b969b1623f1d319886f22baba14b283c30ba
font_01_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10744 bytes
SHA-256: 3040d8ce8d912fccdb293b95c69cf95de84e789591ba3efb8836b42f8d181f92