Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3709a6ffa39437…

MALICIOUS

PDF

80.5 KB Created: 2021-03-31 09:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f97e313d77ec241c082422fcec1c1c1d SHA-1: 503dfecf6c8b8f31f38c66b4ed66e11071c260c7 SHA-256: 1f3709a6ffa39437573acce23b1377e8f513b49c223da0a2d6b3c78cda41a36e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/award?keyword=algebra+1+textbook+pdf PDF link annotation
    • http://sifinujox.sportsontheweb.net/71572103905.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/spring_framework_book_download.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/cantaloupe_island_alto_sax.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://pss77.ru/present_simple_and_present_continuous_exercises_with_answersvn650.pdfIn PDF document text
    • http://nonretloli.site/6818713112653dmk.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/cabelas_12_tray_pro_series_dehydrator_reviews.pdfIn PDF document text
    • http://lebofawudire.mygamesonline.org/ese_lightning_protection.pdfIn PDF document text
    • http://cryogen.me/2854362710jgyou.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/tiger_and_bunny_kotetsu1wzjz.pdfIn PDF document text
    • http://meriline.store/how_to_fix_a_swingline_stapler_878xxomtdi.pdfIn PDF document text
    • http://grantmedica.ru/how_to_program_car_starter_remote_viperng8k9.pdfIn PDF document text
    • http://zelopaqq.xyz/94472901189cdobm.pdfIn PDF document text
    • http://lotsmen.com/nyle_maxwell_lifetime_warranty_reviewsf4ur5.pdfIn PDF document text
    • http://dmdmassage.com/cognitive_bias_definition_in_economicszw8k1.pdfIn PDF document text
    • http://sneakerspapa.store/15017767286pfgks.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/birkat_kohanim.pdfIn PDF document text
    • http://rentline.pro/personality_types_ranked_by_rarityavh3g.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/74401174785.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/around_the_world_bass_tab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixiwajavonuti.atwebpages.com/gatagelazivaximir.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_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 5344 bytes
SHA-256: 4def0a8403c4f6d50f8262a1753757d091e5f0b4d26f22dca17233dcb741b82d
font_01_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 10176 bytes
SHA-256: cfc28d513e6096ea534c8b4f54dd4b33afefe606d3d80b68f1b9210e548b2041