Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78027d37114836d…

MALICIOUS

PDF

83.0 KB Created: 2021-06-11 14:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2ac2f3fce3bb019baeff7c7c0a6e995 SHA-1: 99dc47929f762a3bb894915d23a3fdc6ca464f43 SHA-256: b78027d37114836d55c87ebc3321e5c6d6ebbb4c8b12ae27926fdc6d22b15725
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://cructi.ru/pbw?utm_term=how+do+sea+lions+protect+themselves PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393898/normal_60656d4f7d0ba.pdfIn PDF document text
    • https://xegezutiraviral.weebly.com/uploads/1/3/0/7/130775125/tajojun.pdfIn PDF document text
    • https://xiboraritaro.weebly.com/uploads/1/3/4/4/134464700/eb23f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5fd1c717f3dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_60ba23e75aaf6.pdfIn PDF document text
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/ribozemo.pdfIn PDF document text
    • https://baduravimu.weebly.com/uploads/1/3/4/7/134713966/vasepuxudadumozax.pdfIn PDF document text
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/5770139.pdfIn PDF document text
    • https://xepuduwosijun.weebly.com/uploads/1/3/4/6/134634987/fa04600c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_601dbb4f456cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_602b36719166a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a2d3e74f-4936-43d0-abf0-f50910b00bd8/96144109359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8655cc7f-71ad-489b-b2a9-115ecce19605/how_do_you_make_a_homemade_wood_splitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a595bf-ea20-4edc-9c2c-c266bba35018/lomizatonalexomefenexok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc42133-5cf6-48ae-92ad-19ce54a7dd55/taxunubugopov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65cc91f-d6dd-4264-a3da-5839dd96b749/highway_safety_central_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0f833d-9be8-44f5-b961-b08fd3dbcb9b/wotigozexeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e68f81-ad52-4571-92d9-226ea5ef2952/tempstar_2_stage_gas_furnace_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245257dd-3733-4bd8-837d-f0c6d15a78e3/jugifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6f3a00-252f-4a93-8cb7-dd5306d1474b/introduccin_a_la_biologa_celular_alberts_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 5212 bytes
SHA-256: 312570fa40317142747d3b52d83c23fbf9cf7ac4f20c1a872e63d6887b11c325
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 10932 bytes
SHA-256: c5857c10c0624274c896b4e4e0fda8ba3dc95a0b3f7c2de8396597752b232098
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71