Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1c53d16c79f614…

MALICIOUS

PDF

96.3 KB Created: 2021-03-20 10:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef241553fe7e81dd0cc8c5c6634405f6 SHA-1: 20e1d76e7629dd115c6e519da151624c4bcdecc3 SHA-256: 6e1c53d16c79f614e8af8473689ff4da88c42786a1b9d5e2732722b95f3e88e4
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document exhibits multiple indicators of malicious intent, including a critical ClamAV detection and ML classification. It employs social engineering tactics, specifically a 'ClickFix' lure, by instructing the user to copy and paste content into a terminal, likely to download and execute a second-stage payload. The document also contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • 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.
  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=tracktion+t7+64+bit+download+usb PDF link annotation
    • http://mosebuzixat.mywebcommunity.org/dedupipapekot.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/46561863283adazd.pdfIn PDF document text
    • http://subbellassecret.com/99842185136ovy14.pdfIn PDF document text
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/duwuzote_gosirowojok_vimaporasa.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/710358.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/nodobisi.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/448046ce6cf78.pdfIn PDF document text
    • http://eurozone.pro/gevirewiruwotesy4zf.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/fakuk.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/c6f36b247ae3eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_60288fd5cb8c4fcaa6b0638c4f6ca637.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4a87a5-346d-482e-9ebf-436233d46ce3/sodastream_source_vs_fizzi_one_touch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfc9e81-f5d1-4448-a906-8368e8cd63dd/what_pokemon_are_in_red_blue_and_yellow.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_fcb488f20b79427999d9281533ef1a89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12aea937-48df-4067-aa59-8daddf9aa921/how_to_do_adding_and_subtracting_unlike_fractions.pdfIn PDF document text
    • http://wenibeliso.atwebpages.com/what_makes_a_winner_quotes.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_off00013a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 5500 bytes
SHA-256: 3b8dc24be0d517103cefb4b53cd94cd644d8272beafe694b97939edbfedfed2d
font_01_sfnt_off00014d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 10992 bytes
SHA-256: 80781f7dcbcf50329f44717baaa62092c9815026cb47ec12d1461660d73019f0