Malicious PDF — malware analysis report

Static analysis result for SHA-256 0164702d304949c2…

MALICIOUS

PDF

74.4 KB Created: 2021-04-05 20:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b406c9deffa6b88383f0491461a37c30 SHA-1: 94b7a42642d2bfb96ed5e7ed3f8a584d0f578288 SHA-256: 0164702d304949c2d5d65d878c7518a766c9af845cd19f35961c332976c59fba
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://golowaki.ru/strik?utm_term=g+shock+wr20bar+replacement+band PDF link annotation
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/c88a0af7100.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/meWUYjf/puxowurovatepetukuz.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/dgdsihb/guess_the_movie_malayalam_puzzle.pdfIn PDF document text
    • https://cdn.sqhk.co/nanuvoxeva/RA76VRP/xomojosufowisawado.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/fhgYgcX/dominos_pizza_leones_cumbres_elite.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/VBWjbw3/19237976311.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/tatunekubixisuxiwiv.pdfIn PDF document text
    • https://kasexesupa.weebly.com/uploads/1/3/1/4/131437862/7896416.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/urbana_sociologija.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/tupuxuzoxu-pitamabutoxulu-kixuluko-bujizidotil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabelinowizufe.myartsonline.com/free_willy_soundtrack_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/rezafufojere.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/college_admission_essay_examples_free.pdfIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_969f0010ea794a4ca916cd1429a04fc2.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_7e46fc2bbd854d79acd3b5b21687fd55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/dietrich_bonhoeffer_ethics.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_bc6c46d9ba744d7386d4feca3ba4bf72.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_098c27df70634a358b34488f1738c6b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/dengue_virus_test_report.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_e9e4040f0fa546a7bf9cd3ddd86c27ad.pdf?index=trueIn 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_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 5916 bytes
SHA-256: 60eb18c9ae4c56a6b625b9e876c9a49234068239222440ff54d4a59605eace60
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 10780 bytes
SHA-256: 6b1fe11b27f8cb762e01cdc9ce61dcd303dfdc8480eae0bd8d529971ea128e7b