Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5b702bc5905f5d…

MALICIOUS

PDF

66.9 KB Created: 2021-01-18 01:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d83742a0c2bc27dcb5f57cffd1326dcf SHA-1: 04ffc757edd4b3895c069209640ab516f119015d SHA-256: 5b5b702bc5905f5ddbb805640b37e6622712e2ba34ecb2c759c00693c4a704be
244 Risk Score

Malware Insights

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

This PDF file contains numerous links designed to create a link farm, likely for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily corrupted, contains text related to game downloads, suggesting a lure to entice users to click the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/wb?keyword=chicken%20invaders%202%20xmas%20free%20download%20full%20version In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f900814829e7.pdfIn PDF document text
    • https://site-1241880.mozfiles.com/files/1241880/s__a__o__g_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fb9bd539aa2f.pdfIn PDF document text
    • https://site-1179590.mozfiles.com/files/1179590/gladiator_heroes_arena_sword_fighting_tournament_mod_apk.pdfIn PDF document text
    • https://site-1238130.mozfiles.com/files/1238130/geduwazebise.pdfIn PDF document text
    • https://site-1174218.mozfiles.com/files/1174218/15569546673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fae96e581706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5f8c9a3d48828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_5f94ce11b614f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8869df4f16a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5f9da65c7c6a9.pdfIn PDF document text
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/zikikekefos.pdfIn PDF document text
    • https://site-1178703.mozfiles.com/files/1178703/spoken_english_words_with_telugu_meaning.pdfIn PDF document text
    • https://site-1177462.mozfiles.com/files/1177462/45365460985.pdfIn PDF document text
    • https://site-1178035.mozfiles.com/files/1178035/zivunabivewanokavinujipud.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/12681073196.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 5580 bytes
SHA-256: 7fd100126cc73811a1bb4996f30592479ae9be88ec0d90bc9b84a0b89ca55b73
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10640 bytes
SHA-256: 2976fdf0740dec71695ec6b2c379cb5dd0c1c39b627a25270b90b80900aced13

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