Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e03bfcdadb18987…

MALICIOUS

PDF

92.0 KB Created: 2021-03-25 15:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5b117a223b5504a6d28642b7739c0f72 SHA-1: 9bce699b52d7a8bedce348ef95c48d9c66e7d9d0 SHA-256: 6e03bfcdadb18987af48dcce0a7e56b07c2488bbec9176dab5a6a3e91f151ca7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to potentially malicious content.

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://baarspo.ru/award?keyword=problems+on+ages+in+tamil+pdf PDF link annotation
    • http://jajuviramigawo.medianewsonline.com/star_trek_voyager_episodes_watch_online_free.pdfIn PDF document text
    • http://megatorg.ru/sadazedugapokesele1a3xu.pdfIn PDF document text
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/gapevefutogo.pdfIn PDF document text
    • https://cdn.sqhk.co/dabekojov/jiicIPd/spinach_ricotta_recipes_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/egjhern/stick_with_it_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/4XbaIEg/19702352519.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/kezasanukitad_wabevo_jijitezaw_sozunegav.pdfIn PDF document text
    • http://online-sistem.site/71328118954dhksa.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/jarikebapilelorefufa.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/dhdMiTq/loxetovug.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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://uploads.strikinglycdn.com/files/24410070-6dfb-4e73-919e-53985f265707/dell_u2415_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361e20e6-26a4-43a0-baf2-8360c6caf961/5819148682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfee6262-87ae-42e9-a995-726c19640ffe/7933303266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94d4ff1-e14c-4b59-8876-80a307b3058a/zozixizudopewipule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51e8ec8-10f6-4e64-ae63-4c54d8582ffe/2000_ford_ranger_led_headlight_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5366b61a-74a6-46c0-b5ea-3dbecc9bcf08/how_can_i_get_money_off_my_child_support_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f71faf5-806f-47da-b1f9-b48c0da0910b/cuanto_equivale_200_gr_de_azucar_en_tazas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4931c98c-f49e-4915-9112-c2925aee3d37/comparison_contrast_essay_topics_for_college_students.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/23993650088.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/41631534405.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fe35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE35 22768 bytes
SHA-256: 795e32f6e373062ad5d11a8315487ffa0d516e0fb0818682ffaf13e960a85c66
font_00_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5292 bytes
SHA-256: e32ce83a49681ab5c144df11977f18b60006dce7a3f7db45a0f8c7174b2ec219
font_02_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 11036 bytes
SHA-256: 1435f08ea8f353ca6c429a68ce8703a8be5c3a8df6aa73858dad3b50fd829883
font_03_sfnt_off00015453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15453 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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