Malicious PDF — malware analysis report

Static analysis result for SHA-256 acff274127062b9a…

MALICIOUS

PDF

77.9 KB Created: 2021-05-31 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ae9f82a64d3dca76133849ed6fdaee89 SHA-1: a85c050913fb04bab0cbd281695171b63f850e35 SHA-256: acff274127062b9a412d653afa81fca3d7dbf55a662a12bd1ea645d1ade8a4e9
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://resalured.ru/strik?utm_term=how+to+calculate+voltage+drop+of+cable', is presented as a guide but likely serves as a lure to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=how+to+calculate+voltage+drop+of+cable PDF link annotation
    • https://lokaxanexu.weebly.com/uploads/1/3/4/6/134638146/bunit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_60450f1f9180b.pdfIn PDF document text
    • https://jesaguxofugu.weebly.com/uploads/1/3/4/6/134659129/8ee5b06dd3f777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419198/normal_5fefa3d476621.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/jazawo-zofosoxale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_6010e269031b3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4393179/normal_60aff664bcdb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_605d51344eba2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5ff12914a0bdd.pdfIn PDF document text
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/kanixaledozegi_kuzubumevobu_xufesifisutinu_folen.pdfIn PDF document text
    • https://tuganokume.weebly.com/uploads/1/3/1/4/131452880/bf61e5c6ca.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/3ba69fda8b.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/5122473.pdfIn PDF document text
    • https://bokitixeloto.weebly.com/uploads/1/3/5/3/135344606/maziruxirewonafozome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527042/normal_5ff5fb5dbe912.pdfIn PDF document text
    • https://bunikesetula.weebly.com/uploads/1/3/0/7/130739723/savixomaf-xeponu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_601515fb0a15d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_60023e948179e.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/8ea5d87b-2417-42ee-8414-9ae267c4eafd/58909748053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cea8c2f-af36-455c-86ae-88bfbb162a99/fikoxazirefobixugegip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ecbae48-79eb-4d1b-a20b-1000cec7639a/99836093857.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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5128 bytes
SHA-256: db09a97a747a1b02e4def6b879d9d4ab41085daf29cc8e9032e5fb8a02591f72
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 11212 bytes
SHA-256: 49abb79b4a5057ff10a8bc98391b09e9b49bb25fd12fe10a2bdb24cf89082abe
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71