Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c815fef67b369b4…

MALICIOUS

PDF

93.7 KB Created: 2021-02-19 01:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 07b996a6f61d06689eaad95a88362706 SHA-1: 251b71347f7295217a9f8dc8eff15ffbc4ce0377 SHA-256: 7c815fef67b369b48cd9095798052e0c3e3c75c24edf20fa04061ef2a1b3520d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://crophysi.ru/aws?utm_term=how+to+defrost+ice+maker+samsung+4+door PDF link annotation
    • https://xusedivofasug.weebly.com/uploads/1/3/2/7/132741162/df16ada36dd5.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/zoxigedajevi.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/ab7f27.pdfIn PDF document text
    • http://neritam.22web.org/brother_reset_drum.pdfIn PDF document text
    • https://zutafagufagupak.weebly.com/uploads/1/3/4/2/134235067/997c8a64.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/9aa36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_6010d3820af4d.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/fojifoluselexapoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5fecca8d0efc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/vidmate_app_install_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/texujitowiboromi.pdfIn PDF document text
    • http://dobejul.epizy.com/mystudentbody_drug_test_answers.pdfIn PDF document text
    • http://zozujuzozupu.rf.gd/632803363.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/gcse_maths_revision_sheets_foundation.pdfIn PDF document text
    • http://vowaxuf.rf.gd/thunderbolt_for_battlegrounds_apk.pdfIn PDF document text
    • http://gewevamaki.epizy.com/chrysanth_cheque_writer_software_free.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/87267901508.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/ntse_2018_stage_1_answer_key_fiitjee.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 5396 bytes
SHA-256: cd7a5771093f8f38a6762ed54651895f7b21df76128601c6e7e79cfa4671c5df
font_01_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 10784 bytes
SHA-256: a1a92c425d052c0b3718dfa8e3066e6ebde81849ba261c6680966b783853dcf4
font_02_sfnt_off00015af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34