Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dc167553614002…

MALICIOUS

PDF

70.1 KB Created: 2020-12-17 16:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c9b106168de457cce5b489781860aa63 SHA-1: 9eabe11720c8ab93715442f05d988c6248a71771 SHA-256: 31dc167553614002ca9d59af474e94d63efb39be547f59ef51febcda498bc554
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1059.001 PowerShell

This PDF document exhibits characteristics of a phishing lure, indicated by the 'Clipboard command execution lure' heuristic. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to distribute further malicious content or engage in SEO manipulation. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms this with a 'Pdf.Phishing.Trojan' detection. The document's primary function appears to be tricking the user into executing commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trafffi.ru/123?utm_term=chromebook+boot+from+usb+without+developer+mode PDF link annotation
    • https://mitanifujokuvu.weebly.com/uploads/1/3/0/9/130969645/8225098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_5f9754bf332db.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/zikaki.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/wafizibapafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_5fda4d53d7e0e.pdfIn PDF document text
    • https://pivewunakunajuv.weebly.com/uploads/1/3/4/7/134770464/e6bbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/rea_residential_agency_agreement_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc118eb27a199023ab67ebc/t/5fc542f618e72e5fdb845b33/1606763255638/wanuzew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc284201c8c7413143c29cf/t/5fc4d64c3485235c865e471c/1606735446813/sexojukisotaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ac7f73-09c6-4ffb-9dd3-02b68439d2b6/tazejix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8421b40-37f2-4e13-a5f1-efbd1b4dd8d8/fokilopitu.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/ffxiv_fishing_desynth_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f6561d-154c-42b9-a05c-f339c2a90d94/42850338226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ed199e-7c3e-4a4e-b797-d900150e546f/word_whizzle_alien_level_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/geomorphology_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7615b68c-0977-4823-b1bc-2ff0f319165e/schaums_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/adt_safewatch_quickconnect_plus_user_manual.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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 5332 bytes
SHA-256: c1e6f03cd055c645d06766b22ef6b3c68cd1a25a417a291f2a04bf6dd9a2b4a7
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10512 bytes
SHA-256: 09f5aeb76d89a8563365b0fbc2748706dc45a597679b66e0f1ce91f11ba145fa