Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e6e14f2709d269…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 14:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: aa64c05f05f3081082c4dff5cc48f55c SHA-1: bb0d1c96c6d3d806f646ff5c1b69ffb40347e1c3 SHA-256: 98e6e14f2709d269b5047957038d3c609b95b50809bbe7e814847e63214671c2
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 and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan-like behavior. The embedded URLs and the document body suggest a lure related to educational content to entice users to click on these links, which could lead to further malicious downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://soxebez.ru/award?keyword=group+discussion+method+of+teaching+pdf PDF link annotation
    • https://cdn.sqhk.co/tokexinolelu/tgemje4/sms_messages_collection_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/bxjMDgj/galaxy_shooter_pc_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/kYja7yo/82582679012.pdfIn PDF document text
    • https://cdn.sqhk.co/lowovegoxoji/jdhefjd/apa_format_appendix_example_owl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_b2a4ab6ee1a44d858247dc63af467e78.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_ae5e611272194e6c86e4be3ffaad954a.pdf?index=trueIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_b2541699439947fba362807d0ceaf167.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_6d8acf1cbb7747798119cae9eea25b68.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_1e82b8152f754881aa37052c2491a198.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/54578549708.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_bc310d21b5334450ab44f4f31744c636.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_ac4994f89897424eb3b441531432fcd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/man_on_the_street_steve_allen.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_6da2833c134d4e8ba9ec009c31b739d9.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_98c66fd6e39944e4b9af0f333cc55011.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_cffd7eeffb1945998bcc6052a4a25ac0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/31494775652.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_ce32620c77b94138a3d83bb6a076f776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/ulster_girl_guides_lorne.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/audio_technica_lp60xbt_replacement_stylus.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/gevobejinibinarad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 5448 bytes
SHA-256: 166561a55f775003a1e064b0f46ccf5a80fb5f3030ad1ff14067abb19160c3fe
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 10992 bytes
SHA-256: 63cd2f2a61137603ae2e130e3b2a84da6efbee93b92c526d166d4366e4e4d225
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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