Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7771f75cc4e5c23…

MALICIOUS

PDF

73.9 KB Created: 2021-04-25 09:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 74705e00f7567cdcd0a33292eedda878 SHA-1: 3cf7c8390bbed23d8cc50eb057c0a163efb721aa SHA-256: a7771f75cc4e5c23a1db3773d52f4f1db6b2f98c627b249bf381c294e39d4995
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The primary URL, 'https://xajibur.ru/strik?utm_term=why+is+my+frigidaire+washer+not+spinning', suggests a lure related to appliance repair, aiming to trick users into clicking through to a potentially malicious site. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=why+is+my+frigidaire+washer+not+spinning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425209/normal_603d8a3685277.pdfIn PDF document text
    • http://opros.xyz/does_hyundai_have_a_recalltkmg7.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/47544285674.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/fa34b.pdfIn PDF document text
    • http://teagreen.space/pawebimunopeb0wex1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5feb0369c4f21.pdfIn PDF document text
    • http://xalebiru.iblogger.org/hallelujah_nuty.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5ffd2f4de086a.pdfIn PDF document text
    • http://sibidadaduzej.iblogger.org/14919138711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fca58ba6aba3.pdfIn PDF document text
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/9bbaca.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/furisewofoselixavow.pdfIn PDF document text
    • https://punofusa.weebly.com/uploads/1/3/2/6/132695323/jedasirag.pdfIn PDF document text
    • http://gevifavilovaz.22web.org/hara-_kiri_death_of_a_samurai_2011.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/21287146178.pdfIn PDF document text
    • http://purunuza.iblogger.org/appdynamics_tutorial.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/wofegewana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujalupa.epizy.com/kisunasotuvuli.pdfIn PDF document text
    • http://bijipav.rf.gd/wamodevikitep.pdfIn PDF document text
    • http://sedozod.rf.gd/94390192341.pdfIn PDF document text
    • http://naburonip.myartsonline.com/51336128536.pdfIn PDF document text
    • http://nanakoje.epizy.com/34250340674.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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5628 bytes
SHA-256: 0d85365b4728625a6f903afe7ab811294a4b60348154c9d7e7f494dd2c74b3d1
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10872 bytes
SHA-256: 31985117ddfa52aeeffbaa6dbcf94154b28ffd8024fd6a09fa5cd8b398e93661

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