Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfb6f3c2b70b07b…

MALICIOUS

PDF

80.6 KB Created: 2021-01-22 10:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c7a4d9f4005bfef80ecceedfd9e9acae SHA-1: 6899751d9fef805d1b780267afee84f5bb36cc19 SHA-256: 6dfb6f3c2b70b07b4ead6f14a8fdf07f1a6beca1876d2c76be995f63ef58a48a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=generate+xsd+from+xml+visual+studio+2015 PDF link annotation
    • http://zikemipirelojo.22web.org/66786126354.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/tigpja9/download_candy_crush_friends_saga_mod_apk_terbaru.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/RjighaF/easy_bake_cake_recipes_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/ek6p8m0/ixl_4th_grade_math_standards.pdfIn PDF document text
    • https://wosabawa.weebly.com/uploads/1/3/5/3/135390578/9047801.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/18YLHdG/51346630708.pdfIn PDF document text
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/57d79f2baf28.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/1jg3hg9/limezexawilofiwutetarure.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/fawazosujetod-galupem-dotodupivuf.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/hbjdsuo/kawivewonafi.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/adani_power_ltd_annual_report_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lodibusalibazi.epizy.com/90889799562.pdfIn PDF document text
    • http://nusonakogip.epizy.com/perfect_assessment_for_learning.pdfIn PDF document text
    • http://lenadupubop.rf.gd/baskerville_t_regular_font_free.pdfIn PDF document text
    • http://wetoxikilosawa.epizy.com/golden_kicking_horse_snow_report.pdfIn PDF document text
    • http://wepaxilex.epizy.com/housework_worksheet_isl.pdfIn PDF document text
    • http://vezoxonu.epizy.com/xemijubizanad.pdfIn PDF document text
    • http://dipimov.epizy.com/bollywood_movies_free_hd_websites.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010fab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FAB 21880 bytes
SHA-256: 90df684051687640932e098e932e67a6048c53921c17d1bbe056c57c5dbe3b34
font_00_sfnt_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 5660 bytes
SHA-256: 4f1db7769d9168933d8d85318bf47cef9b3eea88d09ee247b79d13a446a44e48
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 11992 bytes
SHA-256: 739720fde670ec47386f0c75fc25e0d3814fcc9b2c6fc2f6b1e005098ce8f787

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