Malicious PDF — malware analysis report

Static analysis result for SHA-256 081be46fb1b7b86c…

MALICIOUS

PDF

77.9 KB Created: 2021-04-27 10:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4aed12571a06ab3a1aa312b9b5ac54aa SHA-1: cf285c75bfc19a7b74d142e1749424584540200a SHA-256: 081be46fb1b7b86cbe31e7dc8c452de076c3bce185d74501face4156d978eb85
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 0.9984

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://pelibifir.ru/strik?utm_term=foundation+isaac+asimov+movie PDF link annotation
    • http://zoluwofemofuper.sportsontheweb.net/37903061032.pdfIn PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/lupoxovejanunelujaz.pdfIn PDF document text
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/rijav.pdfIn PDF document text
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/02455da3159c.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/ocean_of_safe.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/183795a85d17f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_b55537a902e34d0386ccbd9a0a69fe48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fe1584-d1d6-4aa5-94ed-ba2bb86ffdc5/how_many_comics_does_deadpool_have.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_43bdcefdf63e432a9d4e280e15f98621.pdf?index=trueIn PDF document text
    • http://xesogopobatobop.epizy.com/78829085285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e190bc0e-6513-47a8-baa3-2bcb0f5a72ab/lutanenezabafosoxajoxapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484a1c67-4bac-4cce-a104-de9e6b2fe181/46385125146.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/medir.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_1e98fcebf8fa43dd9c2889a56bc1577a.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_e25e42e0790640318fc2556e4db83613.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc406851-b780-4114-855b-12eb3fd1967d/24034613012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d1d341-c5f0-448e-9150-17851a726983/rheem_18kw_tankless_water_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1911925-0846-4756-90fe-9804335ae358/27662952537.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/sevuwepesafiluxij.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/two_dimensional_shapes_and_their_properties.pdfIn PDF document text
    • http://judejelalub.rf.gd/4842317722.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_de9f822095274c878898f5d672d9ab25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac34294d-7a8e-4250-b6b3-bf26f8d456bc/why_does_my_speaker_not_work_iphone_7.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_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 4972 bytes
SHA-256: 675bede341d18d02097ac3dc13bf36e9408aed052e1c1597c8022bcd3e8489be
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 10344 bytes
SHA-256: 7300979166e3c82c9a86f2fa73e4b66307157acd5af5cff8ffcfdd795f99efa3