Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa321701dbdc9520…

MALICIOUS

PDF

74.7 KB Created: 2021-04-30 12:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85384187e8989a8d0b6515cc10fad57e SHA-1: 1c2662625ef057151209c60a25ba8156a1bad324 SHA-256: aa321701dbdc95204ae458b1231335ae5bf4b25373360473644787dab854de26
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=local+internet+service+providers+mumbai PDF link annotation
    • http://lopitimew.mygamesonline.org/72983290141.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/66131181126.pdfIn PDF document text
    • http://purpless.vip/tafsir_ibn_kathir_english_buy_online_indiahempz.pdfIn PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/255257.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/tizabu.pdfIn PDF document text
    • http://legendbilisim.com/knysna_forest_guided_toursgvfk1.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/bubofevuvipinuwow.pdfIn PDF document text
    • http://podcard2020.site/68946405982dbz3b.pdfIn PDF document text
    • https://tadizusojad.weebly.com/uploads/1/3/2/7/132712436/bukagowasa.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/basawuzuwi-vugumudogaxi-wisoloveped-rikibig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimenevav.epizy.com/31060749209.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/5803661485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85eb8fe7-1705-46cf-8d64-3ceca60df0a8/kologerusibivumavu.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/mlb_trade_rumors_giants_bleacher_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c069bf1d-b42e-4138-ba68-f7f8297bccbf/wolfgang_puck_pressure_oven_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d697aa-6ca7-48ca-b10f-3c325306046f/penirexeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f15db2c-6322-4a89-837c-77bb5b1128dd/effective_communication_strategies_in_nursing.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/tibikatugebaw.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/asp.net_mvc_core_3.1_tutorial.pdfIn PDF document text
    • http://vijesir.rf.gd/81045932839.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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 5360 bytes
SHA-256: 9e6459210c1cbc71c7d328318e9ed93d985a6fe3233468fbd7cfd29d08157eb3
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 10908 bytes
SHA-256: 2ab0fce20668b524c3b05206c4e5cf3f5e57579f3654e84a495825c2065375d4