Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc459f75cd4aa2e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 01:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b3a6bad279d0636742602058d29eab5a SHA-1: 490ada2f51b84d52e06c399ba2c0938fd7937e04 SHA-256: 4cc459f75cd4aa2e85461e501c185d2927d286d5ab55a88a9b33422f116ef5dc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jacksth.ru/award?keyword=basketball+rules+test+pdf PDF link annotation
    • https://xuzajozobesafod.weebly.com/uploads/1/3/4/7/134718295/pefurarifodo-jodibigusejo.pdfIn PDF document text
    • http://specrazreshenie.com/what_is_the_critical_f_value_for_a_sample_of_four_observations3jpdb.pdfIn PDF document text
    • http://sendgrid-de.com/fovolg9hb4.pdfIn PDF document text
    • http://bit-ipo.ru/holt_mcdougal_physics_answerseva6b.pdfIn PDF document text
    • http://dezlice.ru/vibegobikegewalozirujevoc6145.pdfIn PDF document text
    • https://likunemotiro.weebly.com/uploads/1/3/5/2/135299998/7747904.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/gerur.pdfIn PDF document text
    • http://idslim-italia.site/game_launcher_tuner_for_boosting_performance_pro_apkvfsgp.pdfIn PDF document text
    • http://doucheapp.xyz/kamawuwowanudibn9och.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/zebotonepunij_dusenigo_bukakefekidur.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/is_sql_worth_learning_20194n0ll.pdfIn PDF document text
    • http://shop-kid-toys.online/principles_of_microeconomics_notesok78z.pdfIn PDF document text
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/7012747.pdfIn PDF document text
    • http://homebig.space/tratamiento_de_trombosis_venosa_profundamlyef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadedosi/14011751615.pdfIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_8d64d5dba13f4526a6d4c2bb47f935f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/61959611461.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_13e4f0e7044f4edfa10fc78cf38dbc4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9b244e-1ea6-48c0-9814-e1f9d486bfcc/77915115459.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/gitotinagifamax.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_c92065810bd64f0bb4290af7162a54f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/xuteposadavuz.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_fc6fb10270f24f1d845df06eebdd2f0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55850ba2-b877-44e0-ba63-7417102b2b59/how_fast_is_apple_airport_express.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25b1640-763e-45ae-8f08-e961ab21641a/liwavupozipurajeloma.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_9b93c27e8cba4ccfb8d79b1782f71beb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/runawakazezisot.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_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 5288 bytes
SHA-256: d86d68e9d7dc4963dc08a7510369f9e56f38312c13f3ecae25b523a6de9bb0ed
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 11132 bytes
SHA-256: 01e969b8c978aa98a23c617bb0d2adc8a9aeaae3433705ab6174418f843c131c