Malicious PDF — malware analysis report

Static analysis result for SHA-256 595cf32ab856ac85…

MALICIOUS

PDF

92.1 KB Created: 2021-03-18 16:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f62cbc64093e5b7415535402ec442d21 SHA-1: 58dcd04fa91ee139922818d74eea9f75d1c5dc2f SHA-256: 595cf32ab856ac857ecc546c770e831985988180a8205b2cf3b787ee7812ad63
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 0.9995

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.
  • 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.
  • 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/wix?keyword=chemistry+final+exam+review+packet+answer+key PDF link annotation
    • https://cdn.sqhk.co/xevowuto/fFuHibZ/wordscapes_level_10407.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/834bfe187e0663f.pdfIn PDF document text
    • https://nojiwikimina.weebly.com/uploads/1/3/5/3/135315372/nabuzekopa_lunexaxe_fojixifozeg_binafunefenebeb.pdfIn PDF document text
    • https://cdn.sqhk.co/mekekomubun/ijjgjhg/pirumaje.pdfIn PDF document text
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/seredi-wetinuvaretexod-xuxabe-webikefamifux.pdfIn PDF document text
    • http://itali-big.space/278115899691gb14.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/ghjif4W/photomath_app_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/igfhfLd/28450857434.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/d7lgcjj/cinta_luar_biasa_free.pdfIn PDF document text
    • http://bio-ita.fun/xuwosirexilelopovijwuwl0.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/hgpYjhp/filter_sort_kara_dunga_new_song.pdfIn PDF document text
    • https://cdn.sqhk.co/lowimipofevu/uvjfidt/street_racing_hd_game_download_uptodown.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/a9815c68-83ea-49a0-abc9-78878419384a/50317029525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9822f9f-49b3-40fc-8996-1dd57d45500f/67965356029.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/danafoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfacadd8-eaa9-4aa7-a161-869747fb8db3/18149424293.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/zefeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5ee33e-8a56-4946-9fdf-b2620a0c5cb2/47282186588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e1d257-5da0-41ae-a1a3-7a65eaeb7447/19862853437.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/chamma_chamma_4k_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/11944971463.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/imperative_usted_form_spanish.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 5544 bytes
SHA-256: 3e24c609211ac8fcfbad6af06a7c6fe51e25a0fd3a6f566fc1094929d27ada8a
font_01_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 11628 bytes
SHA-256: f43f8aa899aefdb45fa5e83146e5892d30d831b8ee62b8901ea878bb5ba64462
font_02_sfnt_off00014b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B72 16120 bytes
SHA-256: c5b3220a55259303c3059fa68224378e5f98d82e0a5e228e996c658f3385fbd4