Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ad56f0e321e597…

MALICIOUS

PDF

77.5 KB Created: 2021-04-12 08:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eadeefc198900b0798ffd4e5d1d4a8a4 SHA-1: 59d68a1fa0b56452a4f7b932b10afdf78df2d597 SHA-256: 63ad56f0e321e59799699a6fb276a6250458bf31b5261ad9492fd39789c7c57c
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, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL `https://nipisod.ru/strik?utm_term=what+to+avoid+in+writing+research+title` is identified as an external URI. The document body, though heavily obfuscated, suggests a lure related to research titles, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=what+to+avoid+in+writing+research+title PDF link annotation
    • https://cdn.sqhk.co/wevamerazo/cjhgdij/cross_stitch_patterns_borders_flowers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_5fd76b245a0b8.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/ihjiT3X/plenty_of_fish_free_dating_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412768/normal_5ff76a3697cab.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/17848782093b4i2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_60367fe42f553.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/idVhihc/79998652000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5fdb599e81803.pdfIn PDF document text
    • http://arendaavto.taxi/fefuzet0wkf.pdfIn PDF document text
    • http://micrometer25bill.site/wofaganepasumemegujinufcd76n.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/V8dgjgi/pamasorosawasurisuvuvej.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/hfghiaP/xegel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_603f3d8e6fa89.pdfIn PDF document text
    • http://sevastopol.sale/why_is_update_my_kindle_grayed_outdmqp3.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/619aba56-f733-4359-95e3-4454b808a2fa/3004820268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5a5aae-fcc8-46fc-b03c-62c1b79e640b/how_to_get_free_sims_3_store_content.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb49acf-f810-47ef-b1fa-3b349774bd84/dark_souls_2_hack_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d70572e-5e44-40c9-a569-1e4da5378c58/international_mailing_address_search_by_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d95e53-3f57-4689-9044-318b2319b75d/71940268305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cb4553-0bbd-42ec-b25e-f355d4d42543/zigutipebodenanim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f835707c-e08a-470b-b142-26a6337d9610/65942513417.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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 5368 bytes
SHA-256: 309f5b4e171883c60e3e9d0031ef13d837900ae36cbc03efabb6083a605693b4
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 10484 bytes
SHA-256: 427858f3b6f4a96f5c8f3b2f4ca6f64d9d0a34515470b7cf5586f6409d17ec94

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