Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9464ef23581656…

MALICIOUS

PDF

76.9 KB Created: 2021-05-10 03:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 14ecc7c7a114d557327f22908d281aea SHA-1: 2c15a6099339af3aff17412e6a40bb22dfa8187b SHA-256: 7b9464ef2358165617cf7982a3072d6f44c24ecab94f0326a136ec89328890e3
146 Risk Score

Malware Insights

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

The PDF contains a malformed stream and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojanized document. The embedded URLs point to disposable domains and link farms, characteristic of phishing campaigns aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jottigo.ru/strik?utm_term=which+companies+are+not+socially+responsible PDF link annotation
    • https://cdn.sqhk.co/kibizatududo/FjhDogg/5710058669.pdfIn PDF document text
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/zutujowog.pdfIn PDF document text
    • http://busivel.xyz/200871868212hxjt.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/9330550.pdfIn PDF document text
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/nabumatut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fcd5dd318797.pdfIn PDF document text
    • http://jaxebememapi.iblogger.org/81032425074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff096f93d8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_601514bb0ecf7.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/jfhc3hi/kazasuluduviganisijago.pdfIn PDF document text
    • http://samaraexpo.com/jukuzitisatuzx8dfp.pdfIn PDF document text
    • http://dukuwik.22web.org/how_to_use_craftsman_82344_autoranging_multimeter.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/dijhie9/lebara_phone_number_spain.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/kalabafe.pdfIn PDF document text
    • http://wobodepubusa.22web.org/theme_of_post_colonialism_in_heart_of_darkness.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovibole.rf.gd/vogigipukekojusulamadep.pdfIn PDF document text
    • http://gozakovojuri.rf.gd/73187664832.pdfIn PDF document text
    • http://ruwozubusa.epizy.com/wofogutosisabipiwe.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/xufoganowe.pdfIn PDF document text
    • http://wamivofubamaxit.epizy.com/flubber_movie_worksheet_answers.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_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 5428 bytes
SHA-256: 5ec982188956fb98cc8df9379e737eb2337bc845fd7fca4b4eff50af5b4e0838
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 10316 bytes
SHA-256: d14a2ac9adf1e4be20fa362b13a0666ffaef3dae45a3e28d33d2154976079a1f

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