Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a9684ba44ab325…

MALICIOUS

PDF

76.9 KB Created: 2021-05-01 00:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe9fe95769265edd3833f6bcdfe96767 SHA-1: 48ace532c8013f81a3f788a87afe1afcbbc24b7c SHA-256: 83a9684ba44ab325451625c63cd6523a6fcfcc70853b8c5de4cffc5ae543b34b
264 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The 'SE_CALLBACK_LURE' heuristic indicates a phishing or tech-support scam pretext, aiming to trick users into calling a number or visiting a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/strik?utm_term=2009+sportster+service+intervals In PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/vokeso.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/87404081642.pdfIn PDF document text
    • http://tokio-2020.fun/the_highwayman_by_alfred_noyes_worksheetm8986.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/4bc60d3.pdfIn PDF document text
    • http://mugedly.xyz/485901049204znwe.pdfIn PDF document text
    • http://widaxaruko.mypressonline.com/ranexibafebevisofadepame.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/jugeruva.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/88a6f7ba516f261.pdfIn PDF document text
    • https://zoximubovug.weebly.com/uploads/1/3/1/3/131379564/madizixoxija.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/3694975.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/dell_venue_8_pro_5855_lte_specs.pdfIn PDF document text
    • http://igclienteam.com/16605184415z521y.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/20e274ee-30d7-41f4-825c-61f7a5b11d32/zinujajez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4413dd3-00c0-4cb6-b02b-1ffe3dbc1817/pefaxotibufuvikul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbd0564-c938-4bcf-8339-c569e9a73199/inbounds_plays_vs_2-3_zone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf09f2d-ad85-4838-98ce-516952ebeaea/pioneer_deh-80prs_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a627a940-4df8-4c84-86a2-122b16e2f4c0/how_does_briggs_and_stratton_never_change_oil_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9e4bee-8af8-463b-b73f-97ca6c5efc39/toxamefaterijasavevisoz.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/belgariad_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b58b39-e553-4558-8008-9173e54ad732/how_to_use_milwaukee_charger.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_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 5320 bytes
SHA-256: 68219c24ac58f0728e5079a714b3d760e4f643ffe21b7ef094b0c1797f21e4df
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 11672 bytes
SHA-256: a354959e0f1ae53c785f22fea03b96fb343709b4041d0c1968a64344db7337c8