Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac3500b8a4e1b8c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-03 09:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1067ef1bc66ac3c18da5a23cd737ed7a SHA-1: 8ca3bb692134feff58dd649fbb5aebd4c3ee0a1c SHA-256: 1ac3500b8a4e1b8cf3f13ea9c526dd75aa339b0515232086f71048ab5a8f335d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. It contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=starbucks+barista+pay+virginia In PDF document text
    • https://cdn.sqhk.co/kokedipemi/hhi6sO0/smart_goals_definition_nursing.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jAmjfgd/the_chosen_one_netflix_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/BighdCa/70925964591.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/b9ba47f7.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/besebekukiv.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/3e36e0eacf0815.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/99124783293.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/gujojumabojolopup.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/MNbjihb/crowd_city_game_online_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_60183221420c2.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/gMhhXhi/vutamuriramikom.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/zijjbLB/best_photo_editing_software_for_chromebook.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/bimon.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
    • http://pozijawikubinun.myartsonline.com/zejije.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/lonifexowimalas.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/how_to_remove_splat_hair_color_from_skin.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/what_does_check_engine_soon_light_mean.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5192 bytes
SHA-256: 5dc7c5a9742f8d0fffad6d294f425e5a5456f1fccfdb57b40a521ed695a80f50
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 10760 bytes
SHA-256: 114e676724b00a0b059502c44a171c0244985e365c7d2d52210bb128e552b0fc
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c