Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b592425b0c7af7…

MALICIOUS

PDF

77.0 KB Created: 2020-12-31 03:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b9b6e9af6e0e0ad59a05a0c3b77f1095 SHA-1: 7348e0f66481c67647fa1b489ef9ff134b12265e SHA-256: 99b592425b0c7af7262d89efc50939438e5b5fc79e7f3193cc883a3ecd1039d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be related to search terms and potentially lures users to malicious sites.

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://trafficel.ru/strik?utm_term=5+seconds+of+summer+songs+teeth PDF link annotation
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/6287222.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/3OE9ihh/vokoravasunabulaxobax.pdfIn PDF document text
    • https://nenawobu.weebly.com/uploads/1/3/4/1/134131353/nakuxulegujilita.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/wuverobazab.pdfIn PDF document text
    • https://vilinumatilaji.weebly.com/uploads/1/3/2/7/132740241/1539752.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/5164519.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/zerifanikoserij.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/99b7e2cb-1d34-453a-9f7b-ce120f1c0127/reasoning_from_the_scriptures_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd658c74-3662-4c8a-ab10-c7e0fed5682d/suwudol.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/lego_hero_factory_instruction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53bb9bc-bb8d-432d-aafa-58b6862a9599/83140603898.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/capital_expenditure_and_revenue_expenditure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f5beb6-8e3d-4c64-b603-cd35b86b3441/god_of_war_modi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d80c42c-aa04-4662-9903-83e3faad7200/como_se_forma_el_sistema_solar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091fcb91-789d-4220-98a7-db98ba045f40/tempted_by_the_fruit_of_another_lyrics.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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 5224 bytes
SHA-256: 2551178bc1e1f2062c812210afd4b9111744dec1a4e5db47943dca61a751452c
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 11036 bytes
SHA-256: 70c55467de818fcfa69b5b2bb80736a1090e48cb6239f58493babe2b2a40811f

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