Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e642abfc710e245…

MALICIOUS

PDF

67.4 KB Created: 2021-01-24 08:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9fde6943f9bd707df4e46e980522f5af SHA-1: 215ce53089bded083ddb93ffa9602e8c3f9dcfbe SHA-256: 7e642abfc710e245cc9a49c201324514cd458dd6bd33a96546e979c5445e9431
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=in+uruguay+to+grab+someone%2527s+attention PDF link annotation
    • https://site-1168384.mozfiles.com/files/1168384/domestic_rabbit_breeds_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/jf0ighi/download_aplikasi_epsxe_for_android_apkpure.pdfIn PDF document text
    • http://pupofikavize.iblogger.org/moxew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_600b6321474cb.pdfIn PDF document text
    • https://site-1180978.mozfiles.com/files/1180978/12360917471.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/android_one_mobiles_in_pakistan.pdfIn PDF document text
    • http://kiwedoro.66ghz.com/agelong_tree_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_5fd14cb29acf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_5fdc1bfacb692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5fc74ccc279f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novosumagib.epizy.com/basketball_score_sheet_word_document.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/adobe_acrobat_9_pro_trial_version.pdfIn PDF document text
    • http://jukikusikodopom.epizy.com/pekivaraxewa.pdfIn PDF document text
    • http://zerakunutage.epizy.com/lawurupo.pdfIn PDF document text
    • http://wijijatalil.epizy.com/bixby_home_apk_for_marshmallow.pdfIn PDF document text
    • http://fepadegan.epizy.com/cabbage_nutritional_information.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/47680755216.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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 5188 bytes
SHA-256: 28aaafd5937e9299a9afbd3a0e95fc2aea7497641932cf4ec6a17eecbfccce1a
font_01_sfnt_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 10004 bytes
SHA-256: 38a94d8246ca23c8792771ead5ebca1fd3093c009485f506c13f6f3776ce3b13

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