Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0e908f538e8467…

MALICIOUS

PDF

81.1 KB Created: 2021-04-05 21:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 22a4b198ddbc560293362f3a5d3a324d SHA-1: 55f6a802cf1a87084fe90c7cd5d197a76f8bbe05 SHA-256: 8a0e908f538e846779f6c439e6d446e53a8fedcafb284a6a3fbd8279c1b3e17e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=moon+river+chords+piano+jazz PDF link annotation
    • http://tonojodozif.mypressonline.com/circleci_tutorial.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/gexakosonoxoruvefabowe.pdfIn PDF document text
    • http://xixizugujixu.iblogger.org/hollywood_movies_hd_dubbed_in_tamil.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/zepepugowebogaku.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/resume_format_for_freshers_b._tech_ece_free_download.pdfIn PDF document text
    • http://suwadebizon.mywebcommunity.org/search_within_scanned.pdfIn PDF document text
    • http://jelusuvobirolen.mywebcommunity.org/62684355767.pdfIn PDF document text
    • http://dapujabowigu.sportsontheweb.net/43589673147.pdfIn 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/ea9b443c-c2a6-433b-932c-69cb6579574c/what_size_labels_does_dymo_450_print.pdfIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_b1b7f769694d4684a6dd5e2499238801.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_953d826d297c487ea8629a0d60d94702.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/887124e3-3457-4907-910b-21628da7cf61/why_is_my_amazon_prime_not_shipping_in_2_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626c1500-d2f2-4378-a917-08362865f415/lds_childrens_song_if_the_savior_stood_beside_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244416b9-0944-42c1-b6d5-c7350f1359bd/80133377892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b35f59-81cd-465b-9b64-c0a552d2acd3/71850859716.pdfIn PDF document text
    • http://bilonukipi.rf.gd/what_dlc_does_fallout_4_goty_come_with.pdfIn PDF document text
    • http://waruzav.epizy.com/fishing_report_folly_beach_pier_sc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561dba0e-66ef-46bf-8e34-ac8ca5325041/feluzovijisamitolezapifid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae390137-e15d-4d93-8fef-28c9266e0978/adobe_photoshop_cs6_keyboard_shortcuts_cheat_sheet.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/lutodapalewagiworol.pdfIn PDF document text
    • http://mitoxewer.epizy.com/free_rental_income_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5def3b56-a306-42b9-a90e-ae5e982a8082/adolescent_dbt_mindfulness_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c750ac-7908-4179-954a-8e4d328c97f5/what_are_dip_switches_on_a_garage_door_opener.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 5028 bytes
SHA-256: a02677a945b774b67d865aa1a5bc9659b6f8e12b3252ef668b67cab2a82c4817
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 11168 bytes
SHA-256: ecf684fbb3277458c5f84d9eb803c6e6106e48c26193e70782a0631069ef7d61
font_02_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3