Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7bf1a8de6bef09…

MALICIOUS

PDF

75.4 KB Created: 2021-04-08 04:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8b572d72a08e1d2d87becdb000a49cac SHA-1: a23ac3a5fedc7028add2f487f1933705db4dab76 SHA-256: 6a7bf1a8de6bef091607ba90e4f7d40ef56df48c80968085143ad768363d1428
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL observed is https://zajinet.ru/strik?utm_term=what+are+the+key+elements+of+organizational+culture, which is likely part of the malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=what+are+the+key+elements+of+organizational+culture PDF link annotation
    • https://cdn.sqhk.co/rifojimuna/DYBicgh/ge_stackable_washer_and_dryer_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/9jiWihq/14102582371.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/i3sgfjd/best_nova_launcher_setup_backup_2018.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/afro_asian_literature.pdfIn PDF document text
    • http://suwadebizon.mywebcommunity.org/deciduous_forest.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/dggijgi/ffxv_guide_ign.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/5564675137.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/2c369a1f-1ca2-4515-a11e-88f1021d5c1b/lovejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb43c57-e89e-4905-8cbb-c43c9d5ab3c7/2021_toyota_camry_se_awd_review.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/nubezupomowolotulegegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb1e038-e593-4453-acfb-7425c4756711/34778178713.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/what_is_the_new_living_translation_version_of_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbba3e8-346b-4d92-8f2d-201f2d1f580f/how_to_update_apps_on_lg_oled_tv.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_c818d04c01d64a6e84fd0cb2b4b9d96f.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_8e0825cd531340fb880530bf5a425c4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e869357-71af-4d1e-a9de-af8239b7ba88/78456456510.pdfIn PDF document text
    • http://zimopup.myartsonline.com/30399982126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36868dfa-d7ab-44fd-8dd9-ee436dc5eb2d/the_100_season_4_episode_12_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91931ecb-2a4b-4ded-ba78-1d42d5fe2939/1198656584.pdfIn PDF document text
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_fafe31d79142434db743e98a1c52309c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ffc959-00f1-49bf-80de-514558f31415/munson_fluid_mechanics_8th_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6f3b1a-1bc1-416a-867c-bceae388fa69/how_to_configure_my_passport_ultra_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599ad63b-4ef4-419f-8188-3515e0acdbb7/free_program_to_convert_to_jpg_file.pdfIn PDF document text
    • http://powagamojij.onlinewebshop.net/wigamotetili.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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5524 bytes
SHA-256: 9de685b4bedd57cea1f2e50b3796ddeb7a2432b2342fce2a26f49953420fe7ba
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 10816 bytes
SHA-256: 3603170226e4f416e3e67562e4d9f86acb54ae9219432d5d36da31ed7d916c5b

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