Malicious PDF — malware analysis report

Static analysis result for SHA-256 0778a43e60e4e79f…

MALICIOUS

PDF

74.7 KB Created: 2021-01-18 15:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e74c662f93f280152a3eb6c1f19e8098 SHA-1: 3f9376891e3bf20a41978c451adf2707000e019a SHA-256: 0778a43e60e4e79f1bbab665a7626094af408be7fc97d0b6d18d94c58e0006dd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/wb?keyword=ecology%20auto%20parts%20near%20me PDF link annotation
    • https://cdn.sqhk.co/wirowanorax/Nhfhctx/hobby_lobby_paris_tx_application.pdfIn PDF document text
    • https://sozivaxuzafuzi.weebly.com/uploads/1/3/1/8/131856435/d499f09e65986d5.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/gi1qoig/impossible_bottle_flip_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xogeloke/jhjheij/party_city_stores_ct.pdfIn PDF document text
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/996fd618.pdfIn PDF document text
    • https://site-1175027.mozfiles.com/files/1175027/zelawaxitigigopanag.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/id0icic/68106494041.pdfIn PDF document text
    • https://site-1176697.mozfiles.com/files/1176697/35154045081.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/7794be6ef0d3f.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/kcafiju/joker_hd_wallpapers_1080p_for_android.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/f94d4cb9e.pdfIn PDF document text
    • https://site-1176728.mozfiles.com/files/1176728/abyss_floor_85_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamurujitexezi.epizy.com/beamer_template_madrid.pdfIn PDF document text
    • http://gisipusizen.rf.gd/civil_engineering_interview_questions_and_answers_quora.pdfIn PDF document text
    • http://xakafof.rf.gd/66022697739.pdfIn PDF document text
    • http://lemizirimafon.epizy.com/facebook_marketplace_app_for_android.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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 5312 bytes
SHA-256: 4ce3a2945344cfd89a63c1ebdea2098a1609e4d75ea056ad0c730848ac9566d4
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 10840 bytes
SHA-256: dc0cdcfad6772ff903198335b18f63e737b39b884f81dd151bc65dbdf9032bec

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