Malicious PDF — malware analysis report

Static analysis result for SHA-256 082bcc9b0833d70b…

MALICIOUS

PDF

98.7 KB Created: 2021-04-07 20:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5a6a78e4b0c75e02d56398bdca1ccc01 SHA-1: b18f60bfd8c667c0859e38f0922c226991ca69d0 SHA-256: 082bcc9b0833d70b412624e9a21bb4b13569ffc00923fa52311f7139266aed43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=is+under+the+dome+finished PDF link annotation
    • https://cdn.sqhk.co/furigelo/jDjJmjd/pokemon_heart_gold_randomizer_download_nds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_601180ec1aed0.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/eehc0O8/bioscope_marathi_movie_utorrent.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/5626106222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_605aa0db7d292.pdfIn PDF document text
    • http://kelirajisob.66ghz.com/discrete_probability_distribution_worksheet_doc.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/lujudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_606d8d3777457.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/anti_aliasing_filter_design.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413697/normal_60058d38532cc.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/cMiigiZ/55830810807.pdfIn PDF document text
    • http://tesapewuj.22web.org/biwirirakitusuvesi.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/wupiwupiwot/what_is_a_review_paper_in_science.pdfIn PDF document text
    • http://xoxejafomi.rf.gd/biological_basis_of_love.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/vibasava.pdfIn PDF document text
    • http://luturuwuxas.epizy.com/83765268225.pdfIn PDF document text
    • http://saruwuf.epizy.com/50373081187.pdfIn PDF document text
    • http://fusiwati.epizy.com/fagurikuwiwugekuboxuse.pdfIn PDF document text
    • http://gawowupakifofe.rf.gd/13176478505.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_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 4844 bytes
SHA-256: 06697ee5c0666dfff0ce4d08d0472c28b10a42382769ca97383abad71ff9660c
font_01_sfnt_off000155d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D9 11876 bytes
SHA-256: c8abd82f15bfdbca5b1dce3ffefca25ad33d7fbf099050a663f7ad73759260d1