Malicious PDF — malware analysis report

Static analysis result for SHA-256 19aebc333fdedc99…

MALICIOUS

PDF

82.4 KB Created: 2021-03-15 12:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 446af59753c6bb0336ed73f6526bc151 SHA-1: 1cbc0704652344e823f35ad453da6ba77ab7e275 SHA-256: 19aebc333fdedc9988850a7aa93b2768f24a34d6731031911ce432d53e092af7
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 pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=what+soccer+means+to+me+essay PDF link annotation
    • https://muzaromiv.weebly.com/uploads/1/3/4/3/134380281/7225e67fa5b7d.pdfIn PDF document text
    • http://okclub.org/soundpeats_truewings_wireless_earbuds_reviewytrdc.pdfIn PDF document text
    • https://bagamijak.weebly.com/uploads/1/3/1/3/131380043/1727419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd1128b3c528.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/program_bmw_garage_door_opener8cwcl.pdfIn PDF document text
    • https://lonirukigosoz.weebly.com/uploads/1/3/5/9/135965403/dumovawefasuxotete.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/ef8d4a8a3.pdfIn PDF document text
    • http://shopyou.online/how_to_earn_money_from_home_part_time7ov6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_5fd91d3ac3cbe.pdfIn PDF document text
    • http://bigwin-1xbet.fun/nijavewofarcssz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5fc9ec83a21a8.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/304ad486f710.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/amsterdam_public_transit_map.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/84524b3f-c5a1-4ed6-89b4-ce1f3b6fcb09/how_to_lose.weight_walking.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_013cf04a0c2d4851919a2861edb500d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b868290-bf70-416a-9ef7-b803768633d6/how_do_i_create_a_gantt_chart_in_excel_2016.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_156944229c8b4f198b3cb5cd47439ac0.pdf?index=trueIn PDF document text
    • http://tajiroxajesolut.atwebpages.com/59083390951.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_d477b69fb32c43f6a51e7ab260a21e55.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_9d843a2edd614f3cb723ee609aa5b41a.pdf?index=trueIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/kawebuluwapezuzisor.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_a964b86290454921a0279a56f056f29b.pdf?index=trueIn 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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 4864 bytes
SHA-256: f9e11909221d566d3489afa89c5cce980cdf6b9391a2c06bd38432414f7350a8
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10720 bytes
SHA-256: c04de777469344e455c5c5562086a04b2554a529c09a530be099399a4dbc9105
font_02_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e