Malicious PDF — malware analysis report

Static analysis result for SHA-256 993e20dbe653bf93…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 15:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e2cc6a37f60a68c77d92d9e88a321f79 SHA-1: e49a3d5da6ff4b468fb7a8815eafdb91f5923a41 SHA-256: 993e20dbe653bf932333ca797304bd3e2c5b07e6a4a7057455831a8cbd448c26
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://yafferge.ru/strik?utm_term=2008+dodge+avenger+battery In PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/zetemode.pdfIn PDF document text
    • https://cdn.sqhk.co/sesizame/KIhhegf/instagram_app_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/nidEwhj/bounce_tv_on_spectrum.pdfIn PDF document text
    • http://dreabling.online/christmas_carol_emoji_pictionary_answerss2del.pdfIn PDF document text
    • http://scm03.ru/what_is_an_operating_system_simple_definition80xqh.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/ijt8ie0/47576114460.pdfIn PDF document text
    • https://fiketizi.weebly.com/uploads/1/3/5/3/135387405/lipogolab-nerovun-kevot-xumudivetow.pdfIn PDF document text
    • http://proita.fun/992214377260p3j2.pdfIn PDF document text
    • https://cdn.sqhk.co/rilepama/bgdjf2K/wupuwofazozoli.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/vebipo.pdfIn PDF document text
    • http://leomannapov.com/12999206242xcphl.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/eGNjgsT/clumsy_ninja_master_suit_cheat.pdfIn PDF document text
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/e7d6aabc.pdfIn PDF document text
    • http://opssmall.space/janativilinigikeno0esai.pdfIn PDF document text
    • http://espacecmb.xyz/pavarejazenusorefixat5g7s.pdfIn PDF document text
    • http://closemaze.com/kexisunewasasumomifejaucuo5.pdfIn PDF document text
    • http://twobigs.space/92272913281iy226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_ca94ce9212bd4a76893458cff94a7da7.pdf?index=trueIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_1ae8972f022d440ba4da432d12d54d8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/46071585204.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_74c7c9bff5be4de2932402ac17983c24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/baluzovaxakusegopar.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_1761917f92e54de398d980c89b246775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekezaru/test_de_raven_especial.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_7b56b3ae822f4835ac9672724408d819.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivuxo/pirowofaxizifod.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/54189238833.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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 5456 bytes
SHA-256: e587b87440b1335e846f6fe5f96efd69fa6c416cd50eafb6e93b9f733fe04b1a
font_01_sfnt_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 11348 bytes
SHA-256: fa1e9c1658ad8f2a363b990596320b71f4ad31765794c5fc59170f9ff707b5a7