Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53588dbc041ea63…

MALICIOUS

PDF

163.2 KB Created: 2021-04-17 01:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1c8de119f7640fd95ecec75b0825c699 SHA-1: 7163197c222b8df23e52f50099de72d4ba2634d9 SHA-256: c53588dbc041ea634b9bf4e1695a4bbb2b042f1742e0f952794008c585eba4aa
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://golowaki.ru/strik?utm_term=agatha+christie+malayalam+books+free+download PDF link annotation
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/wugodagosunadu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jil7Xgi/39180228675.pdfIn PDF document text
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/weloxenexid.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/fjg6Cig/77311267904.pdfIn PDF document text
    • https://purigimotefejis.weebly.com/uploads/1/3/4/3/134308192/pisugel_zunuk_nuviranade.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/hyZhfgi/pineapple_pen_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/akgdF8p/karomezebuzufufopumapebix.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/bA9hhgg/snapchat_logo_blue.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/AukQib5/faninapolaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/hchagij/39549508470.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/xomudododi.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/uicCZJx/haro_extreme_x1_mountain_bike_for_sale.pdfIn PDF document text
    • https://jopovasido.weebly.com/uploads/1/3/4/6/134619877/c4a42c4b.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/Diiijhc/horse_mannequin_apk.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/a85112df-8297-4860-9d77-4d54753d3bb1/guxivuguxemoxuwajux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd06cbe7-29b0-4664-b48e-933c97a786e7/photoshop_cs2_training_videos_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/sozegoluzuzowaxusexir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7d808c-11cd-4006-a10a-8bde6f81bb55/zebra_zp_505_driver_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716c8401-9da6-4315-b78d-cfbef1f55e9e/vavosojazinotexi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/zumujuketopufenemedus.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/how_to_pair_logitech_headset_h600.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/5924955592.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_off000241fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241FA 5824 bytes
SHA-256: f5a57547e353363399a79f85e0c760f0c7eb2386ff7ba5b1eb8170470a8b894b
font_01_sfnt_off000255bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255BC 12168 bytes
SHA-256: 8e24cf905d89bcc0f4bfaf7af2f59d149a7a9611e0d89e98dcbf53be6fbfa469