Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa49f30d40b3ce5…

MALICIOUS

PDF

83.1 KB Created: 2021-05-30 15:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b35e1706f5a9b691fd5b5fb995cf1e91 SHA-1: 14d11b21d9faa6dba8a6438ba903cfbbe8139078 SHA-256: 8fa49f30d40b3ce58e115e5877056d77c74ee4052cd591430aae9f9d655374c8
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 0.9990

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://jumiwimov.ru/strik?utm_term=how+to+connect+tp+link+extender+ac750 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443809/normal_60262c555b7c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5ff798e80cd0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_606358284c358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_601655cbcfaac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_603271f907fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_601db43a42bf4.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/pevudawolomabo.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/tuwelixujiri_bazifetagab_rokuvigunipulu_kiroj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_601f14e430aed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_60646eafadfea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_60168a8bc31e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_600e77e7426cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fd31489381a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fcc28b16429b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_6029ce620b2d8.pdfIn PDF document text
    • https://xexezakofiwojuv.weebly.com/uploads/1/3/4/3/134372147/gewofa_kowon_bigazosu_raweledozoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_601b3c5dbb11e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_600bf0ce97b48.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/xiputiwolora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384045/normal_5fe2a3d1065c8.pdfIn PDF document text
    • https://jexetapi.weebly.com/uploads/1/3/4/3/134345775/6672b70a6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5ffe98fe296ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e52335-05ac-4d89-8e3a-22a3e36a2bdd/brinks_outdoor_led_security_light_bulb_4800_lumens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce4d390-b40d-4e12-b890-393d90090611/81554677788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ea9a1b-b7b2-45db-ad9f-65c99b16f1db/turkish_march_sheet_music_piano.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_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 5420 bytes
SHA-256: a54d83f7458b4b18e43be96080d38d3dd856b623db73b6488d98ead766e24a28
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 12084 bytes
SHA-256: b741237542092b62da0cd95359b424715a948b0b315fa82cceb140e5481323ce