Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b86c9eb31b6d87…

MALICIOUS

PDF

91.9 KB Created: 2021-03-28 18:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b72c64b39b348561af056b220b3105ff SHA-1: c6e335a2a85d19de049e2b36e9c2f593bc29b939 SHA-256: a2b86c9eb31b6d8757e8e1cac16abc83c4afd27776966264940b7b0a1b5a5bed
244 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The embedded URLs, such as 'https://crophysi.ru/award?keyword=the+final+solution+michael+chabon+pdf', indicate a phishing or malicious redirection attempt. The presence of numerous links to disposable hosting services further supports the link farm hypothesis, likely intended to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=the+final+solution+michael+chabon+pdf In PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/5ca0a25000.pdfIn PDF document text
    • https://tanaxafim.weebly.com/uploads/1/3/4/5/134501517/lamebel.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/2ffc5e5d860c623.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/damipup.pdfIn PDF document text
    • https://dupubevanedi.weebly.com/uploads/1/3/4/6/134649007/957fc2809a2dabb.pdfIn PDF document text
    • https://dupigonaw.weebly.com/uploads/1/3/5/2/135297060/boxigosusoxem_pajopozuw_kamakud.pdfIn PDF document text
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/jipofazusoxomere.pdfIn PDF document text
    • https://vuxosulaleko.weebly.com/uploads/1/3/2/6/132695375/fazibelotiga_lovedi_mugukagifelul_viliparefidofux.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/9416299.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/9005440.pdfIn PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/2b866ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_ac92394dc6574babbd8681253f14436a.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_666079ac120142a495dfd57046979135.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/remiwutuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/what_did_the_third_estate_of_france_call_their_parliamentary_body.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_5137686b3b864a8aad4185f0ac5be678.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/vibip.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_23c6a6e25d894e689f6918270cc5e662.pdf?index=trueIn PDF document text
    • http://kavafaj.rf.gd/karcher_repairs_brisbane.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/ary_news_urdu_apk.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_2a998c34d51649079ae9651f00cae4f2.pdf?index=trueIn PDF document text
    • http://xepumobokuv.rf.gd/tujimakotefodo.pdfIn PDF document text
    • http://xuxusemo.epizy.com/android_device_manager_without_android_studio.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_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 5388 bytes
SHA-256: 114a249f08be770c71f4e3f544b87b7784636426fc52d2ad9a00b3575eeeb629
font_01_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 12168 bytes
SHA-256: c975e9a6f5f0b66fd5757206c0bc59c3a4f1ee94c96850ddca6fbfc105481578

Open this report in the interactive analyzer, or submit your own file for analysis.