Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d3c364a7416352…

MALICIOUS

PDF

75.8 KB Created: 2021-02-27 00:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ff73b72e57bc3f63ae4965492c247188 SHA-1: 14729572bca46cb1d8fd979973e36488273891ba SHA-256: 78d3c364a7416352d4145c1a687e819d6bf8efa4bffd56a6aa619d774043a3ae
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary one leading to 'baarspo.ru', likely serving as a lure for the user. The PDF structure and embedded content suggest it's designed to exploit user interaction to redirect them to malicious sites, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=oster+coffee+maker+clean+cycle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417537/normal_60397047e82a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fc75a726447e.pdfIn PDF document text
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/6e24712da8027ab.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/gejikulujoj.pdfIn PDF document text
    • http://circulshtangcalip.website/ravebevenijenxbg5n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5fdff20833e0d.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/kogitafazulupik_mijeganafak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451955/normal_5febdd478a8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426676/normal_5fdb9bb39793e.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/iggijba/zidofe.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/wodar_laredajiwexemin_musoribotovojes_zodirovu.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/xafaxotaful/ashapurna_devi_books.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/56473853483.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/archer_c7_dd-_wrt_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/69836560973.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/7248935748.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_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 5220 bytes
SHA-256: 3352c590a2b726e8157c2bd8b5b55001b1f8b42744b6f0dfdd19b3027c493fe3
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 11128 bytes
SHA-256: a8622e8e93057de1dc6e21dfbaefc4e6d52b9e2779ec6dee648369c2fd59ff50

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