Malicious PDF — malware analysis report

Static analysis result for SHA-256 253f06695a625441…

MALICIOUS

PDF

68.4 KB Created: 2021-03-24 03:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 882589cc31fd981fde954b606f3fbb9e SHA-1: 19a3d327551b79055ba710f15de73ca54ab51306 SHA-256: 253f06695a6254418e321a3d8f82c102d022951d4567efa17ce6a98d619ea4d2
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=timex+alarm+clock+nature+sounds+manual
    • https://cdn.sqhk.co/sileluzorupo/ajbehgh/34110366937.pdf
    • https://cdn.sqhk.co/gisatajofo/cWiaIhg/wildlife_puzzles_1000_pieces.pdf
    • http://wotukujis.sportsontheweb.net/77792574693.pdf
    • https://cdn.sqhk.co/veladaxuzeba/dOkqQTT/bet_award_shows_2019.pdf
    • http://jobediniberine.scienceontheweb.net/what_is_to_analyse_something.pdf
    • http://volalagokiva.sportsontheweb.net/vunidiwukabav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1483e7e0-82ba-4fb2-b30c-9e248863c73e/nurotujudeliretodu.pdf
    • http://napamewa.atwebpages.com/rationale_of_the_study_example.pdf
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_23ddf6854af54440a76f0835365703e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c9bc5124-e492-47b5-a592-1732871cf26d/batepumex.pdf
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_02a9f885c97c49ed92966cc4831b39c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b66ab2fb-8e1a-47c3-bb7b-56ec4db35db3/88725966844.pdf
    • https://uploads.strikinglycdn.com/files/218689c2-d43e-44bc-9e59-6bc8df9e4bc3/rebecca_daphne_du_maurier_hardback.pdf
    • https://uploads.strikinglycdn.com/files/64159c39-0b20-42fe-85ba-fc5e8ebfdca3/61543420293.pdf
    • https://uploads.strikinglycdn.com/files/f8aa686f-986a-40cd-83f8-3b860d1da1fe/1174370542.pdf
    • https://uploads.strikinglycdn.com/files/f6d862f6-1116-4954-b785-5a426916cb7c/moccamaster_by_technivorm_kbgv_select_coffee_maker_canada.pdf
    • http://vawofirulev.myartsonline.com/andromeda_ethiopia.pdf
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_477a542089ad431c9375fafdd95855ea.pdf?index=true
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_e437e00d57ce4e42a469094e881bfeb9.pdf?index=true
    • http://judiserod.onlinewebshop.net/taber_s_cyclopedic_medical_dictionary_23rd_edition_free_download.pdf
    • https://uploads.strikinglycdn.com/files/c1aea46b-1a70-4ccf-87c2-6f2b8f4a98db/how_do_you_answer_a_jitterbug_flip_phone.pdf
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_ab671c5ce4e2400abf52c3bd815ae5bb.pdf?index=true
    • 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_off0000cc8e.bin
63bae5481471d5563b6ba8cd9f621e6e5853e8f437416986ebadce0efafed355		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 5164 bytes
font_01_sfnt_off0000de07.bin
a1262ec29606fa0e0cc7df1672ceca938ac5661bbf4e4cd9685a82ef8ea0fd83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 11212 bytes

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