Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a37ff639d6c389…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 00:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8176133277fc21595f6fd519b6e6bf9 SHA-1: 78e84b1ed55fb4dfe483a6e6c0bf8c638f0dea26 SHA-256: c7a37ff639d6c389aa170ae41b6cc786a349608309c7828e656a62148b6819c2
156 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 are generated in a SEO-like fashion, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. The embedded URLs likely lead to malicious content or phishing pages, and the document's structure suggests it's designed to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=b+arch+aptitude+test+questions+with+solutions+pdf
    • https://cdn.sqhk.co/segenapiza/igcxmle/best_buy_customer_service_hours_of_operation.pdf
    • http://excschool.ru/brain_rules_for_baby_john_medina_free_download2kup4.pdf
    • https://cdn.sqhk.co/konafomaz/hDih1Pd/57796789024.pdf
    • https://cdn.sqhk.co/fuxuduxexi/1IVhhNJ/apple_knight_action_platformer.pdf
    • https://cdn.sqhk.co/kaxonavi/jejfhf4/five_esports_manager_game_tips.pdf
    • http://websecurer.tech/98362575480hnkva.pdf
    • http://frukt.fun/where_can_you_buy_an_edenpure_heater3unam.pdf
    • http://ibkreactiva2020.com/23375740334sgmo0.pdf
    • http://testvvd.xyz/japanese_mahjong_rulesv15kn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuzamada/girodamukoru.pdf
    • https://s3.amazonaws.com/lewuli/katufotubobunesenobegubok.pdf
    • https://uploads.strikinglycdn.com/files/66779a77-0f42-4640-afa1-8d147b99f10b/38875972265.pdf
    • https://uploads.strikinglycdn.com/files/941f280c-d724-4ad7-8e60-f255872cce3c/kuwupofibixuru.pdf
    • https://s3.amazonaws.com/wozoxub/47308917380.pdf
    • https://s3.amazonaws.com/sojebelevenex/free_printable_2018_calendar_templates_with_holidays.pdf
    • https://uploads.strikinglycdn.com/files/f0c7d8f9-e247-4412-891c-a20ad10e3e3c/53197635140.pdf
    • https://uploads.strikinglycdn.com/files/afe8b0b5-1c86-4ca4-b3de-274dd9ba3ffd/damatoxikefutogu.pdf
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_cd7270c861744ee789d2fab84a0c7eee.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_cf5c464cac9f4b4aa267e71d1c62700a.pdf?index=true
    • https://s3.amazonaws.com/zafijukopa/59781909665.pdf
    • https://uploads.strikinglycdn.com/files/2c5b43f2-9926-431c-b345-160a0f305036/sap_business_one_free_download_full_version_with_crack.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_2097d321ccc34364bd36eed51aa6de74.pdf?index=true
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_fd7e912b636745d9a34b548da6bf1434.pdf?index=true
    • https://uploads.strikinglycdn.com/files/674f21ac-0288-4d65-8821-ae4c867c7396/romeo_and_juliet_quiz_act_1.pdf
    • https://uploads.strikinglycdn.com/files/6b336bb4-ef35-48fd-aaca-236823a0a316/the_6th_and_7th_book_of_moses_part_2.pdf
    • https://uploads.strikinglycdn.com/files/33a066f2-e7b5-461c-8e96-b266c194867c/68140340096.pdf
    • https://uploads.strikinglycdn.com/files/24ef185f-0630-4cdc-a7d3-ff78d3a3be97/washington_football_team_new_name_news.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc3f.bin
b79f5ad7903ef9857f8a0925252e30890fd269e2d89f08271e3fc1563a4fc084		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 5508 bytes
font_01_sfnt_off00010f05.bin
881ae35ccf245faf8e9cfe36610b563b3a7f5f998b81d2e3032a0c7857f2d0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 11380 bytes

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