Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b016497507c1eb…

MALICIOUS

PDF

80.8 KB Created: 2021-05-19 20:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 732b03f437dd96dc15f63479d33251a7 SHA-1: d2c9a47a8ace516b6c0073073197957c7a444890 SHA-256: 43b016497507c1ebd8ee687427182666942ce0acdd3641290ee6ffa5308f5607
156 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 pointing to other PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of malicious intent, likely to drive traffic to malicious sites or for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=asme+y14+5m+1994+tolerance+table
    • https://cdn-cms.f-static.net/uploads/4406473/normal_604da7a9c1aae.pdf
    • https://cdn-cms.f-static.net/uploads/4418001/normal_6041dde887826.pdf
    • https://mokonalu.weebly.com/uploads/1/3/0/7/130739423/88fdf.pdf
    • https://cdn-cms.f-static.net/uploads/4464522/normal_6057c01e40e45.pdf
    • https://cdn-cms.f-static.net/uploads/4403948/normal_604eb2d817fca.pdf
    • https://static.s123-cdn-static.com/uploads/4405443/normal_5febe68175863.pdf
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/xuzudekovewunef_sevebukeluwi_kodesupar_dijabulufabu.pdf
    • https://cdn-cms.f-static.net/uploads/4366633/normal_603ab5025ce6e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuselufuzo/zijibofafunajemuzaguzivi.pdf
    • https://uploads.strikinglycdn.com/files/4140cf28-800e-4728-9439-db756cab4c1b/how_to_set_up_q_tv_box.pdf
    • https://s3.amazonaws.com/lakadutof/dasitezedibevopuwato.pdf
    • https://s3.amazonaws.com/sixenogafopoj/husky_energy_annual_report_2017.pdf
    • https://s3.amazonaws.com/genukopapovixo/jujiwuwab.pdf
    • https://s3.amazonaws.com/kaxukok/date_difference_in_google_sheets.pdf
    • https://uploads.strikinglycdn.com/files/0e338d0d-dbc9-421d-8a2b-fad0d55c46d8/how_do_i_fix_my_blurry_brother_printer.pdf
    • https://s3.amazonaws.com/lanubili/why_does_my_dish_hopper_keep_restarting.pdf
    • https://s3.amazonaws.com/setigafat/black_and_decker_cmm1200_lawn_mower_24_volt_battery_charger.pdf
    • https://s3.amazonaws.com/mubefula/john_deere_115_automatic_owners_manual.pdf
    • https://s3.amazonaws.com/lusegokaves/10611322720.pdf
    • https://s3.amazonaws.com/xonobijikivo/what_are_the_best_wood_chips_for_electric_smoker.pdf
    • 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_off0000fd5a.bin
c456498d90e8004244cae3f613e7cdd2808f765012bd67291979cb7ea7e4f62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 5596 bytes
font_01_sfnt_off00011067.bin
5b2bbdddd7e533c07e865817e1f92a13b0fb2bf0651754b812db3cceffe9ddc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 11052 bytes

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