Malicious PDF — malware analysis report

Static analysis result for SHA-256 79570bb77edd5c5b…

MALICIOUS

PDF

66.2 KB Created: 2021-03-26 12:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7367ab6d98577662424ec8708ac7a7 SHA-1: 3439da532477b888c746df20e91cc616e136bd62 SHA-256: 79570bb77edd5c5b3c1ef1b50da3cc07398c048b26f10e0ffbb2a95907030949
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Price elasticity of demand worksheet 1 answers'. The presence of embedded URLs, including one pointing to 'bologen.ru', indicates an attempt to redirect the user to a malicious site. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=price+elasticity+of+demand+worksheet+1+answers
    • http://vubureteka.22web.org/avantika_express_indore_to_mumbai_platform_number.pdf
    • https://cdn-cms.f-static.net/uploads/4370088/normal_6056b8aa16aa0.pdf
    • http://tasefuvakol.22web.org/linked_list_using_template_c_program.pdf
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fddb5b035cd9.pdf
    • http://sukojas.22web.org/mopilalojabarevagegibexa.pdf
    • https://cdn-cms.f-static.net/uploads/4384460/normal_605a6016be171.pdf
    • https://cdn-cms.f-static.net/uploads/4367019/normal_604cf51b110e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pazizota.rf.gd/report_expired_food_singapore.pdf
    • http://bozudob.epizy.com/82649695726.pdf
    • https://s3.amazonaws.com/tutasujal/ranuvazozomabiwenagux.pdf
    • http://zadobimad.epizy.com/abruptio_placentae-_rcog_guidelines.pdf
    • http://suzurexitumafod.epizy.com/example_internship_report_accounting_student.pdf
    • https://s3.amazonaws.com/nedijowewoded/79144861824.pdf
    • https://s3.amazonaws.com/kosipefojaw/clear_acrylic_sheets_lowes.pdf
    • http://vefapiba.epizy.com/45467900295.pdf
    • http://gofosuxubajo.epizy.com/23550418303.pdf
    • http://wereguvepowu.epizy.com/barood_bhojpuri_movie_free.pdf
    • http://wozaloruwogilo.rf.gd/toro_super_blower_vac_bag_51618.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3bb.bin
28cc84c9a3be3e1725773493a381e27719ae1c804f17e5761cede44a485d6e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BB 5572 bytes
font_01_sfnt_off0000d69f.bin
eaae3553fe764cf082ae944a139d64ed2b4b0786cd88b4bdb72f3876b93b6930
pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 10736 bytes