Malicious PDF — malware analysis report

Static analysis result for SHA-256 740f47c6d5d36c72…

MALICIOUS

PDF

81.5 KB Created: 2021-01-31 03:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a50d0e2c57716e1cde2c6e775d778517 SHA-1: 1173dced0143f8d3932e718a2f2c57cc4ec6de53 SHA-256: 740f47c6d5d36c72562687ced2f513ef0cad5dbb1816db4606ac7aa57d4f21fd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and a link farm. It contains numerous embedded URLs pointing to potentially malicious or disposable domains, with one URL explicitly identified as a known malicious redirector. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic findings strongly suggest an intent to lure users to external, potentially harmful, sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=html+interview+questions+and+answers In PDF document text
    • http://pihodze.com/gewopijozefesanikutejl83ae.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/jijpgcI/happy_chef_menu_daventry.pdfIn PDF document text
    • http://qrettalq.online/ant_colony_games_mobilewhull.pdfIn PDF document text
    • http://itdomen.fun/24573844714yyxws.pdfIn PDF document text
    • https://xeziguga.weebly.com/uploads/1/3/5/3/135392729/8811600.pdfIn PDF document text
    • http://arfesopt.com/walozoxakarom2a0h.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/JhhNgfh/777_casino_avenue_thackerville_ok_73459.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/pqifeii/nuzegisow.pdfIn PDF document text
    • http://bu-markett.com/pedometer_pro_apk_downloadb7v45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5ff6bed6221f7.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/gNiIie3/jumupuvuniroginur.pdfIn PDF document text
    • http://datinge.site/kasurimujifogewedepinosszmqu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_600183a43bec2.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/kabakejel-nipukesisejeb.pdfIn PDF document text
    • http://idealsit.fun/trillion_dollar_coach_accompanyinglne67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5ff68625ad060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://semodozafilisu.rf.gd/free_printable_capitalization_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://zelogano.epizy.com/72341841817.pdfIn PDF document text
    • http://xurolawewetaw.epizy.com/folozakulesonutugetaxu.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_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 5208 bytes
SHA-256: 6386f175255306476fd131431185c4ef5c915b3024ab45acba0cccde01e7ce1f
font_01_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 10972 bytes
SHA-256: d4c120d1d773837ce7409641319d6b419e779a3d7cb42093ace17f03964cbbcb

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