Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b021cb8b456feb…

MALICIOUS

PDF

83.1 KB Created: 2021-03-15 14:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 75774f12f11efe01442803723e7af7a2 SHA-1: a9e80d2ffca98b94c1286f9bfe414b9752754011 SHA-256: e7b021cb8b456feb3b52e2ef882f229a6b881cdf8d7ffd90affcf65b2f0e538d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the heuristic firings and URL analysis point to a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/123?utm_term=harmonic+oscillator+quantum+mechanics+problems+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366048/normal_601e607651669.pdfIn PDF document text
    • http://rigares.iblogger.org/run_on_sentences_exercises_with_answers.pdfIn PDF document text
    • http://zakemelevij.iblogger.org/37264471166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_601e4e67a63e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_6040df693dca1.pdfIn PDF document text
    • http://nezumogeto.iblogger.org/nogisilewujavovo.pdfIn PDF document text
    • http://kojibataruv.iblogger.org/bifesta_cleansing_sheet_moist.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/rezipowiwofatupotoruzix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekinomigaw.epizy.com/are_any_smithsonian_museums_open_today.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_101b4654e7e04d66b0cb0ff28a1acf38.pdf?index=trueIn PDF document text
    • http://vefugiw.epizy.com/jufilulepusorezufava.pdfIn PDF document text
    • http://gedamodeges.epizy.com/pivisevapetunuludi.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_e64a01166181415fa60f4c1a4c893091.pdf?index=trueIn PDF document text
    • http://kisolapuri.rf.gd/fugegopidarosuf.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_061b710d5b2146bf9fdd71ad0a53fdb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0e1167-4842-46b6-ad5e-809ac2471237/how_to_learn_the_music_industry_as_a_singer.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_672dc246343f4a5a9ea96a8c064a5a1e.pdf?index=trueIn PDF document text
    • http://nirutavikuda.epizy.com/92278582948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000fe486-a2ad-4839-b1b0-69d4b91d1afa/tolozebuxinokewimutenidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83557dfd-3655-4501-a699-e539f1fd1c65/merujufij.pdfIn PDF document text
    • http://donafilozevore.rf.gd/how_to_apply_transitions_to_all_clips_in_premiere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec1fe6f-43b0-4b7a-8e97-e38e31429e32/8396526673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8ba081-f808-4e3f-92b0-133cfc52e77d/8435622042.pdfIn PDF document text
    • http://vifewupanog.epizy.com/27005968111.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 5624 bytes
SHA-256: 0acc144a5f698f33169939b664d0bd6fe99290ede0a66cebaef9b171ecbd6c94
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 11048 bytes
SHA-256: 61bf4195e13f3e26e6c6524db35cb0991f88af1b291ce82877aeb5a519f431d1
font_02_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf