Malicious PDF — malware analysis report

Static analysis result for SHA-256 204f8e04b27ed49d…

MALICIOUS

PDF

94.1 KB Created: 2021-04-02 01:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b422534b93dcff3d74ce00efc5058cd9 SHA-1: f4961e224ee42efaa035658714dfb546db04b483 SHA-256: 204f8e04b27ed49d7839cf1231e76aee108a83d597f26a5feaf3a5b8bf442caa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=rebelion+en+la+granja+significado+de+los+personajes PDF link annotation
    • https://mibajajezek.weebly.com/uploads/1/3/4/0/134017497/9584fed7fc9ba.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/macmillan_destination_b1_grammar_and_vocabulary_with_answer_key.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/53758376185.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/introduction_to_shipping_industry.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/berigudari.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/65f68.pdfIn PDF document text
    • https://kesadoxiluxar.weebly.com/uploads/1/3/5/9/135974677/3f4254cd41ecdfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/vegetarian_food_list_for_bodybuilding.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/koka_kola_song_free.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_3218c678a6f149dcb1dfb9a1322071fd.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_92ac5534d72b4f9ab2be42033df925d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/android_get_battery_cycle_count.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/64665393130.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/event_critical_path_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/98717205120.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/dorofoxazegon.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_068013e04ac840619574c42a68bfb086.pdf?index=trueIn PDF document text
    • http://vobikeretuwof.atwebpages.com/refractory_hypoxemia.pdfIn PDF document text
    • http://xenexafa.myartsonline.com/barron_s_ap_calculus_13th_edition.pdfIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_b5883a46df2747e493160200f22ff2b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/58249933759.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_63482f0563c44e6f8e4d45850b0b3ab6.pdf?index=trueIn 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_off00012ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD0 5544 bytes
SHA-256: 8d1f7cc7ae8f5cd8db3791c5585fb3c5d3abf88bb44a44314cb1a30062323471
font_01_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 13660 bytes
SHA-256: d54cfe6c5c9e90f21225808b5ffb2220201fcd53f26263c9a67cf32f6a318db5

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