Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ac6d14f283b76e…

MALICIOUS

PDF

86.0 KB Created: 2021-03-06 07:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9065897dd4d4c93bc50e2cb0917ea999 SHA-1: 13f269c506a3d64f3e26909bdc750385186e602a SHA-256: 99ac6d14f283b76e399737a46f99d3325f9af45ad0313eaefbb3485bfbfa73ed
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous links to external PDFs hosted on disposable domains. The primary link redirects to malicious infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://yafferge.ru/123?utm_term=where+to+buy+polaroid+600+film+cheap In PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/c99c5c.pdfIn PDF document text
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/3917773.pdfIn PDF document text
    • http://bellissimo.online/vizio_vx37l_manualt3afc.pdfIn PDF document text
    • http://dresdenpharma.ru/10369892830n7wx1.pdfIn PDF document text
    • https://kevakebotewixo.weebly.com/uploads/1/3/4/6/134605863/709a248db1b4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/ggfgkig/38411841508.pdfIn PDF document text
    • https://purusexubike.weebly.com/uploads/1/3/4/0/134000510/7472022.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/1420451.pdfIn PDF document text
    • http://muzoc.xyz/acrokeratosis_verruciformis_pathologyh3j7j.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/oje1geY/76246868429.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/jodufukid-duzim.pdfIn PDF document text
    • http://eslivdrug.space/50786520806jr6r.pdfIn PDF document text
    • https://wawurekufa.weebly.com/uploads/1/3/4/3/134322490/kifozulejupaz-raboteli.pdfIn PDF document text
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/kokuguzedigigu-munezevopi.pdfIn PDF document text
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/ruwevikuda_wilaj_beban.pdfIn PDF document text
    • http://formverifiedbadge.com/951811320661yxy1.pdfIn PDF document text
    • https://tijawuxegolizad.weebly.com/uploads/1/3/4/5/134597381/2401060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dumupa/10176746055.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/darigikijegog.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/dulopitatinuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a1a1ac-6801-45fb-9d47-809bd2d6dd97/2002_ford_focus_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009eeae3-ec93-46c5-8d78-da2962c47dcb/finding_audrey_characters.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_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 5768 bytes
SHA-256: d5f94b14299b99b55bc75b84eae537c51667cbcd163bbbcc5014d41e0895c184
font_01_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 12520 bytes
SHA-256: 2cdf0fdd400692e4223e445aee11de162b767d66f4f0ce4e5908fac923f12083