Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed31321bb71f7b2b…

MALICIOUS

PDF

72.7 KB Created: 2021-03-22 02:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b56fba7beab4c7777516dd6c2df7b4ca SHA-1: 55300ba7bc896337d940e05a13d73ecb039712a8 SHA-256: ed31321bb71f7b2b28fa761cb06d0d1aed9d654de4e4c725ca794642ad2d0024
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the overall structure suggest an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=annotation+dictionary+pdf PDF link annotation
    • http://findfreegirl.com/woseri2u9kx.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/balance_ball_game_download_for_laptopzr9cm.pdfIn PDF document text
    • http://13millions-warzone.store/how_to_stretch_out_your_piriformis_muscle0pc8k.pdfIn PDF document text
    • http://zoosalon.org/2935513040ri13a.pdfIn PDF document text
    • http://nickned.me/logos_and_rhemaz9im1.pdfIn PDF document text
    • http://milky-rp.space/best_book_on_asian_historyk2bbi.pdfIn PDF document text
    • http://fapseo.ru/how_much_water_in_all_american_pressure_canner40bch.pdfIn PDF document text
    • http://vbnmcxz.xyz/danby_mini_fridge_not_runningyw8li.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa0427c-0494-4eaa-b34e-37d0865a7183/kuvafejilugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883da163-1d5d-49fe-8cba-42e8c42c4d51/72367389921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc91c84b-05c2-4126-b129-48de73b53552/john_deere_316_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d77a1b-ece9-4e36-b38c-2b83b1ba4268/wowidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02871744-c000-4d18-a411-7d707b772bc8/dapeparupamitivamipe.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/77092881596.pdfIn PDF document text
    • http://gajovab.epizy.com/61065879691.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 5028 bytes
SHA-256: 36a63857954a93c674bccd7baf58a375233f12a2f199302f2106530d2fac30d7
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 10972 bytes
SHA-256: aa33e08df0ce06601dbba88e3e80f5d380531193312b652630a3f5f63c9531d4

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