Malicious PDF — malware analysis report

Static analysis result for SHA-256 079c21dc103f384f…

MALICIOUS

PDF

97.4 KB Created: 2021-04-29 03:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 20459871310d4fe32c6956abf9318420 SHA-1: 91d95cf306b7f19456e126720c6464902d9a7373 SHA-256: 079c21dc103f384faab2c8f2bb7f58083296fcbef9bdec589bbea246e0bc9bb5
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 of which point to disposable domains and are likely part of a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document's apparent content, "Nirvana shatakam stotra in sanskrit", is likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=nirvana+shatakam+stotra+in+sanskrit PDF link annotation
    • https://cdn.sqhk.co/fekigimuzib/hfggGHm/pivebedupixudove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406785/normal_6008b89c254d8.pdfIn PDF document text
    • http://zawuruliwisevo.iblogger.org/dobiwudakapawewerer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_605d6640dbdcc.pdfIn PDF document text
    • https://wikamarelifegef.weebly.com/uploads/1/3/4/3/134380256/2828929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fd323f57b2f7.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/b4iIje4/43596792848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_5fd6d447e5f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_6026bf140db56.pdfIn PDF document text
    • https://vilawapa.weebly.com/uploads/1/3/2/7/132740366/ledipurej.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/how_to_install_cosco_scenera_car_seat.pdfIn PDF document text
    • https://rabunuzo.weebly.com/uploads/1/3/4/5/134502988/976927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd66fc884ddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_6067ccc38de54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5fcf28789dd5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/molilivokilanitotisojuna.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/wheel_on_the_bus.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 4984 bytes
SHA-256: 7b024bed6399fd1e519e38030c79f4272b03888a4bebe9edfd748a451754d3dc
font_01_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 3772 bytes
SHA-256: b850e935aaf604f3e1824861b6c46746957ce6d0e1401f4bf16d070b42224529
font_02_sfnt_off0001243a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 13104 bytes
SHA-256: 19f906ae8422cfd05e661030503c49abeeeb49cb12b99e45ba9d2c6169605b53
font_03_sfnt_off00014c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C67 14512 bytes
SHA-256: 30c8ad13d285f9d07a2f1e104e31b182a8057b12fcb5756172d9b4f8b5cd81e9