Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cdb6ccf45fc386…

MALICIOUS

PDF

77.2 KB Created: 2021-05-24 18:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c6eb246e916ace2bfca0df5ddc56c336 SHA-1: 1cd0176dceac7d1ca943f057e6dae21bef00e108 SHA-256: b2cdb6ccf45fc386c9571f202cb621d650122777dea44632460c851e6fc0f953
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=how+to+write+a+sale+agreement+letter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393791/normal_6025e891c3b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_602b78e0f15f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_604349acac0fa.pdfIn PDF document text
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/b6b3dc.pdfIn PDF document text
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/341978919.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/sasaluvodesite-gosemal-pubojenomuwot.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/jonomix-nogufuxox-setij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501041/normal_5ff043d878b71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_5fe64404d43c1.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/9148762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_603545379d380.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/3576102.pdfIn PDF document text
    • https://gizarokidobibaw.weebly.com/uploads/1/3/4/3/134363860/fovinil.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/wabopifonozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_6042c1755ad5a.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/f1b81baf-35a8-4b83-9a84-5fd02061583a/71067637166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e9d9b7-af5f-457d-80c1-6f6a26715799/vigubezukonawozujipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcddaa7-f68f-4110-8da5-5cea37c98528/basemamumujugaxaxuref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8bb505-e7d1-438b-9b0b-07ca094089f7/how_to_drain_water_from_samsung_vrt_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7380e3-59a0-45ef-a8b5-f2ab46d45586/2001_subaru_outback_2.5_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766fffe8-20b3-4910-a80d-248ce73955cb/60686158415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38982cac-88b9-47ba-9965-39c813e14e19/1455649742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62adb9a5-8726-43c5-a45f-3b2ce2344317/13465699835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e4c6a7-d48c-4cfb-9ff9-702b840c693c/crookedstars_promise_manga.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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 5056 bytes
SHA-256: 4717abdf9a5a1f905fea7104dd8b9953cce01abdbab56d17c394c120a249ee15
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10984 bytes
SHA-256: 1cb8c346f67842339cb58b8a13e98c38fd890753a1abae9bbb39be7f59f1d522