Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d2052c32805c85…

MALICIOUS

PDF

89.2 KB Created: 2021-04-23 23:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1c45b405d47eae4c080d7985353d6438 SHA-1: cd48c58b0f5106ebd8f04cb5ca980e4368606872 SHA-256: b0d2052c32805c858f208dd66a0fe59ff3e1592f4fb362fe8aaccf1534027c4e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=what+is+economic+system+in+china PDF link annotation
    • http://xasekijig.mypressonline.com/kuzugubofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fdd36da1b4e5.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/64018948320.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/types_of_reinforcements_in_composite_materials.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/23150862990.pdfIn PDF document text
    • http://amsidgi.xyz/vera_edge_compatible_devices37c2j.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/autoclave_reactor_design.pdfIn PDF document text
    • http://nikaold.site/how_to_calculate_the_number_of_molecules_in_a_compoundx94qn.pdfIn PDF document text
    • http://boforobevuziko.mywebcommunity.org/cause_and_effect_of_cigarette_smoking.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447267/normal_5ff0421f0c82d.pdfIn PDF document text
    • http://joy-todays.online/english_dictionary_full_words_2020fpv7b.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/cameroon_history_since_1960.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/jutipiwevimop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5fc83c0395172.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/apache_poi_generation_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35edb697-dc4b-4d20-b687-70b35e803199/funeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59a2ea0-c780-481f-9efe-74cdbe1b1983/86215622073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c20fac2-0fbd-4e1f-816b-c55832f7d36d/5605573364.pdfIn PDF document text
    • http://saxarivoje.onlinewebshop.net/sokaduxuneka.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/9200256051.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_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 5028 bytes
SHA-256: c1d1065799d2f0e59f840ddda2b58235153bc1d9a6d37e6005f9917ff6e8ed16
font_01_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 10456 bytes
SHA-256: f9477e9184d5004427737dabf302b480086b909b2d3a39001d00ec995c283237

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