Malicious PDF — malware analysis report

Static analysis result for SHA-256 37806bd946a1bfb2…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 49dc4335870261e6de39bcfd0ece3a30 SHA-1: cb17b58ddc558c10a74f9f673d4b7acf005b3f96 SHA-256: 37806bd946a1bfb2a01c62ce82e4aa4be034ba9dbb27ee9b09c1be439d823656
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://jottigo.ru/strik?utm_term=essentials+of+understanding+psychology+13th+edition PDF link annotation
    • https://cdn.sqhk.co/lupobikud/fihic8b/42787108091.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/c0idkIo/tafamoz.pdfIn PDF document text
    • https://cdn.sqhk.co/dusawugivepo/hjig8jb/93000134292.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/gfLhagc/ufc_fight_card_tonight_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/DicIpii/status_video_download_telugu_sharechat_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/B4gfUzF/shudder_tv_shows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_a4e9bd66a048400198d5d74d04fa64ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/workshop_practice_series_spindles.pdfIn PDF document text
    • http://wodefelid.rf.gd/animoji_and_memoji_android.pdfIn PDF document text
    • http://rowesupigoz.epizy.com/92336884502.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/how_infrared_tube_heaters_work.pdfIn PDF document text
    • http://potovoz.rf.gd/biloxagivix.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_7ce31c364824410695110ea3297adade.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/arlo_smart_home_security_camera_system_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/data_mining_examples_in_python.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_209100c7f6db40c4976ab3d39ee0309a.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_3cc942435a5d44d6be51234b31707eb3.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_6fe5777c761c4042bcece01924361c3d.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_29ca262abcf749a28e6fe6f2ec8cd40a.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_07f24b3e4a024e7ea9c53208d827061f.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_fd27ac106a9044a8ab67ddcd9730d00e.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_c1fdfb551d8a406698013235fcfa0082.pdf?index=trueIn 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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5692 bytes
SHA-256: 6c7041055e5e87abc1ca36d9636d0b2ad25708a0916844ce6f2e9c170a1f5a1c
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 11332 bytes
SHA-256: bc921c64a80c9d86ece0d7bc61c37fa38a7054eb45f7e488167f08f3684eddd0