Malicious PDF — malware analysis report

Static analysis result for SHA-256 df70368d296127c6…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 15:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ae972b0cecddd015e68a035c0a086205 SHA-1: 62c9fce00e2f0e0aad415f5960d07ee21038adc3 SHA-256: df70368d296127c658e336b423a03748b56ca0eaa7308fa7a91a5704e4f86a00
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be related to search queries, further supporting a phishing or scam attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=what+paperwork+do+i+need+to+purchase+a+used+car PDF link annotation
    • http://wemorewabadeluz.mygamesonline.org/39472290512.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/adobe_flash_player_version_11._1_0.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/toshiba_satellite_l755-s5244_memory_upgrade.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/clinical_chemistry_laboratory.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/how_to_calculate_the_residual_value_in_accounting.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://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_8b3b331b350b4447943ffb248f0f266c.pdf?index=trueIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_2b29955be536454badcd6da05170e772.pdf?index=trueIn PDF document text
    • http://dufobirufo.atwebpages.com/poxewaropobakekubo.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_2cc6e327ed664f34b295be827c4340ea.pdf?index=trueIn PDF document text
    • https://acbe2b0b-ee64-4eea-b0ce-372b1aa9cc7a.filesusr.com/ugd/4bcc67_b30c63a9e3be4ba8b5e6c6ee821d83f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d911441-3cc3-400a-a209-8463c40361ae/how_to_load_my_bostitch_staple_gun.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_2e94d7d488e04196b3fec8adaaee8d4c.pdf?index=trueIn PDF document text
    • http://gametusepezuka.rf.gd/brinkmann_smoker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a44aac-f1cc-429c-8ce7-c8e34ae18080/what_should_my_hcg_level_be_at_5_weeks_pregnant.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_d00b010b0e5a43fc98b638983b8fb0ea.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_f97c2977ebd84043968abdfd358ea03e.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_0a934f1cf2db4693bca90edf644484cc.pdf?index=trueIn PDF document text
    • http://xajumin.epizy.com/hp_elitebook_folio_9480m_audio_driver.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_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 5180 bytes
SHA-256: c9490c8572772bdfc8d5f79ce6d41cb35d8ccd49d193678c854548324c117a44
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10504 bytes
SHA-256: f7749a9d0ed6c45d2274813012a1c2d94d9c71db0b53cfac680b6b6bb3d17f42
font_02_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34