Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e302651b58677c…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 08:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 35de865b1871ffe8f3af9149a68215fe SHA-1: 51a5a9d3d43ea451c2dc35176798da1fa787510f SHA-256: c3e302651b58677c2a12083ba981598074dd6d1a1a6b90babe9c82532a4b29ed
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/123?utm_term=expanded+form+worksheets+for+3rd+grade PDF link annotation
    • http://grandov.pro/aladdin_cartoon_full_movie_mp4zrb0p.pdfIn PDF document text
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/kotip-tokeva.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/826043875760d19v.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/4087839.pdfIn PDF document text
    • https://mujonuwamuvix.weebly.com/uploads/1/3/1/3/131383921/293e70dd5a.pdfIn PDF document text
    • http://prizinsta.site/64330488861wm9re.pdfIn PDF document text
    • http://magnifioco.site/akcent_thats_my_name_instrumentalc85e6.pdfIn PDF document text
    • http://lightsex.ru/loralowinogubujejakouzzpc.pdfIn PDF document text
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/26e7e4d980448.pdfIn PDF document text
    • http://circus.market/sword_art_online_light_novel_volume_18_read_online1djsg.pdfIn PDF document text
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/1480672.pdfIn PDF document text
    • http://im-marceting.site/free_game_of_thrones_season_8_downlob77tf.pdfIn PDF document text
    • http://creditscorecard.info/negufextg92.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/salojas-mizifi.pdfIn PDF document text
    • http://logvoz.ru/3886933717azbgh.pdfIn PDF document text
    • http://badge-verification-center.com/dragon_city_mod_apk_unlimited_foodr7a0i.pdfIn PDF document text
    • http://kengoru.space/45403851789z1ecj.pdfIn PDF document text
    • http://ductsunlimitedins.com/wemokenipimavu6lyhz.pdfIn PDF document text
    • http://es50off.pro/xfinity_dvr_manager_appzv5oc.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/777e2da54a63.pdfIn PDF document text
    • https://gekubuneka.weebly.com/uploads/1/3/4/0/134041200/5651338.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/3b509b1c-7f41-43ec-8d2e-1b6af8f62d71/75336025375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe3408c-f13c-4c35-b434-eb7d946418ea/child_short_stories_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a4239e-ad8c-40af-8414-eee5737bb95e/youtube_poker_cash_game_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d390bb06-e83b-433e-87ad-802030c49c84/lojejidarajisot.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_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 5768 bytes
SHA-256: 99d641be592afebf0068a28eb7953d23a75735a26b8e2c747f94ac7e801034e7
font_01_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 10452 bytes
SHA-256: 915767ad76313b4286eec0f7a99b37669c278c0b1dbcbd256147c4aa946fd0d6