Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f773327b739373…

MALICIOUS

PDF

119.0 KB Created: 2021-03-15 03:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0ca05754c00d4df5b257ed2cc1b7a679 SHA-1: 052533dbc28b93ec72eb958a07c9face8c740d1d SHA-256: 36f773327b739373db68fd6fbd6a5c3e60e3fbd6089bf05168ab5d8d89487631
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one primary URL pointing to 'ponafet.ru'. The presence of multiple external links, some on disposable hosting, suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=which+scenario+is+an+example+of+the+transfer+of+thermal+energy+by+radiation PDF link annotation
    • http://fesagudomaluke.22web.org/hd_movie_site_top_10.pdfIn PDF document text
    • http://wordsideget.top/niralilageradaloel6bp.pdfIn PDF document text
    • http://swiss-gear.shop/what_the_elephant_symbolizesax9vq.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/1b3ff96e-303c-4f80-8d29-1f9371b84327/30468194212.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/61404557700.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_cdebf13102b94c57ad81467c1bf623ee.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_eadb54e0d18542c3b20675560369a113.pdf?index=trueIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_36f871c1b4294206a0ba63555f28bee3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/soapui_tutorial_javatpoint.pdfIn PDF document text
    • http://sonedef.epizy.com/tap_tap_heroes_strategy_guide.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_a3d81defbaf44afa9454b31f6c21e014.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_032b87e39f55413388b56e374bc0607c.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_e3f4dc2a9fcc49f3b1a6c31da9b1322c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9163e20a-647b-41c2-a1ff-4de406f50179/dating_scan_accuracy_at_16_weeks.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/red_lobster_green_beans_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/28499900900.pdfIn PDF document text
    • http://likuxusodim.epizy.com/71459570830.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_3bbb0028d2c443f5b278bc2ac7a2f517.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/188893f1-1e17-495a-9636-17fedca09866/62774424416.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_off00018685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18685 5680 bytes
SHA-256: 749cefa02223b525679800a18a776ec0ca4a2e56ef6aba09a1c953bc6eb91588
font_01_sfnt_off000199af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199AF 11028 bytes
SHA-256: c128e087daac8322c1052a85246552f96d9398570e515a2816c25c4d9c8aa1ba
font_02_sfnt_off0001bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF3E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e