Malicious PDF — malware analysis report

Static analysis result for SHA-256 61497266650afcf5…

MALICIOUS

PDF

70.8 KB Created: 2021-05-23 18:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 724928caefe9a3757a795d08aca8fdc3 SHA-1: 372ee8e33351ae587b0aba05b3c056da6aee6c7b SHA-256: 61497266650afcf5f77e59f54ace47b1674d73a8dfee504c2406a54a5f6e607d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting itself as a download for 'Essentials of Investments 10th Edition PDF' but redirects to numerous external PDF files hosted on disposable domains. The primary URL used for redirection is https://gimoguvi.ru/strik?utm_term=essentials+of+investments+10th+edition+pdf+free+download, which is part of a larger scheme to distribute malicious content.

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://gimoguvi.ru/strik?utm_term=essentials+of+investments+10th+edition+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454170/normal_6000a2273704c.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/8472576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fdbd58b77ef4.pdfIn PDF document text
    • https://daregunomunozo.weebly.com/uploads/1/3/4/7/134723938/ffb8faf0ccf3.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/wabaduriluzibej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_60557d8a65f70.pdfIn PDF document text
    • https://xokefazekuli.weebly.com/uploads/1/3/5/9/135992394/mijuxa.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/fiwuvunusafez.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/24115a9d4.pdfIn PDF document text
    • https://xalitive.weebly.com/uploads/1/3/4/3/134320973/tixufi_doxewugijib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_60403c8e81bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fd67e19c2000.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/bulanogegiteje.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/bb67ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_6023870c7cf44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5fe56f1bb9028.pdfIn PDF document text
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/45e29294.pdfIn PDF document text
    • https://begukuji.weebly.com/uploads/1/3/4/8/134880386/jisiwanilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_6019c692be76d.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/951bb33c-3254-43fb-815a-df3344ae1895/dulosafumeked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2cc215-d260-486c-ab61-83275d57142d/wolfgang_puck_pressure_oven_rotisserie_29-liter_countertop_oven_bundle_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6025ebed-62e0-447a-8c16-1eade04a4a4a/excel_formulas_multiply_quantity_by_price.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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 5584 bytes
SHA-256: 4934488d397ea06b45902b4e2c3999c0fc74e6ef479459ac73107aa3dfa85280
font_01_sfnt_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 10784 bytes
SHA-256: 09f49db325c61f38998dcccc2cef9b114bde4ec2b0e2dccd75f0f4ac5e222ee0