Malicious PDF — malware analysis report

Static analysis result for SHA-256 1845e8da30555c75…

MALICIOUS

PDF

77.5 KB Created: 2021-05-26 15:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 48686b37a391097c23f8518dd5b24036 SHA-1: 475bb9950a8adda3489535f7b1da20a084415b47 SHA-256: 1845e8da30555c754c1e694b059e3a61c9d457354f26be3e9ed13c7d8f59a750
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 phishing campaign. The document body, though heavily obfuscated, contains text related to curriculum vitae templates, likely a lure to encourage users to click the embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious websites or download further payloads.

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
  • 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://fokemale.ru/strik?utm_term=plantilla+de+curriculum+en+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486778/normal_606756e76c520.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/3974148.pdfIn PDF document text
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/gidezonadow.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/mesaz.pdfIn PDF document text
    • https://wesulabiduzipu.weebly.com/uploads/1/3/4/2/134235649/baxoguwiwufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd2259d6f0b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6014a1be1d74d.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/wapenugebibawaxakopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_606aaee8f19d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_602a098e96569.pdfIn PDF document text
    • https://sidevobu.weebly.com/uploads/1/3/4/8/134866687/7410363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fc593f7db8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_5fd85bb74564e.pdfIn PDF document text
    • https://wawawafux.weebly.com/uploads/1/3/4/8/134896626/14857d7a.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/c8e01654-82cd-4c83-834c-c4d82028200e/83608004658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a399d9b8-4692-4183-b2bd-0a1e20f0be04/breadman_plus_tr800_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fd8a0b-8268-4afd-9179-aa6532b8ec0f/69369994612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30c36bd-adcc-45e3-ac3e-d80734f3e418/gidivenomuxuzitulufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a078c3dd-f0fa-4f8c-9a05-ec5f2eaf80ef/how_do_you_reset_a_braun_thermoscan.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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 4884 bytes
SHA-256: b6fac6f413c9cbbbcd978aa2b2808f6c00930ffd7d0b8dfac144ec7d8bd8887c
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 11660 bytes
SHA-256: 7964a4b610a9549aa4bbfcfb8e36e520b48138a2a6d3a993e872c199b13c644d
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f