Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7adbaa82718400…

MALICIOUS

PDF

70.8 KB Created: 2021-04-05 11:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 365041801c83165987de86c8c006377a SHA-1: ddc99e064461b45efa2d8ca0ae790fd19561dd38 SHA-256: 5b7adbaa82718400de65e985142d0c692639180ee7f783f6465918259d968af5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, suggesting it functions as a link farm. The presence of URLs like 'https://midufefew.ru/strik?utm_term=on+the+road+with+steve+hartman+secret+santa' indicates a potential phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to distribute malware or conduct phishing campaigns.

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://midufefew.ru/strik?utm_term=on+the+road+with+steve+hartman+secret+santa PDF link annotation
    • https://cdn.sqhk.co/dugixikisim/CYxiiFo/panda_pop_cheats_1421.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/lubusafoxewawek.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jj7idss/211873915.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/qmhhsSw/14565372570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600d4c74bfc73.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/didXnjw/anatomy_of_brain_and_spinal_cord.pdfIn PDF document text
    • https://rijumiwotoresu.weebly.com/uploads/1/3/4/4/134490354/90a72cf.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/738264630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443362/normal_6039e0fdbc117.pdfIn PDF document text
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/3896195.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/75ed0184-267a-4612-b436-293b7a95c48c/fokamawutozesukibojapared.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b799a8-0569-4054-a741-09b817de3f31/tiwerigafenusolexolizow.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/54930180104.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/fesokopekuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec85c05a-748d-4561-99d4-16f9a0d53e96/zunubanojixojilogaki.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/chesil_beach_information_centre.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/freeze_my_credit_report_experian.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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 5324 bytes
SHA-256: fd64436f7ed1e307c99deffd55c2cb80fc59489f63291af04b170a824136cf86
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 10488 bytes
SHA-256: eaee3b5a351a6b67fe90cb1c08974fd2bfc7c6fd1d663d02e327f49ada437364