Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cdfaf0a13696eb…

MALICIOUS

PDF

86.9 KB Created: 2021-04-30 19:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 92e1fb5cdf560c66b2ac6969a420ae0c SHA-1: 77238ca5b15668226b0c4c6a2728ac08cc968b6d SHA-256: 71cdfaf0a13696eb572ee2c86b9b33b6257f3cabaa9af028cbdd30c32184cd56
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 4

  • 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://fokemale.ru/strik?utm_term=alex+rider+movie+2006 PDF link annotation
    • http://sungo1.space/83146530172isv5s.pdfIn PDF document text
    • http://sikutamilom.iblogger.org/bototezebotonixokewir.pdfIn PDF document text
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/luvupadoxofusawa.pdfIn PDF document text
    • http://robertferrell.net/whats_the_age_limit_to_join_the_military_as_an_officerdu832.pdfIn PDF document text
    • https://sogenaluvejor.weebly.com/uploads/1/3/4/3/134328850/xabim.pdfIn PDF document text
    • https://wegudogixudefup.weebly.com/uploads/1/3/1/4/131438345/b2ff58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6031abb02a37c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5fc9081010fa0.pdfIn PDF document text
    • http://vehicleusains.com/dizuwixi40zzg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_60688e79ecc60.pdfIn PDF document text
    • http://laitlabs.pro/how_to_get_rainbow_six_siege_for_free_pcr5c3a.pdfIn PDF document text
    • http://chaptejvxz.fun/rexodinifunejazemdh2w4.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/bf564d5b71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://majojevonomofu.rf.gd/81611588729.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_19d7ae0776494c6fb07b606356add047.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/33687744439.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/67989828575.pdfIn PDF document text
    • http://silapopo.epizy.com/38883916889.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_b098c0ca1a7b4e698641a3d131807f0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudowo/23873771923.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/anomalous_secondary_growth_in_bignonia.pdfIn PDF document text
    • http://dokilenosabani.rf.gd/tovowen.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_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 5128 bytes
SHA-256: b63cc8f5e24c7b36a12363c19d97563ed8364a843f63c4d9533c4364b508b862
font_01_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 11352 bytes
SHA-256: 8d42806e67455d70be8395f6b3e90e5119e25489f221d8c1db29ec60cc2501d7