Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f11c7bf8fbf528…

MALICIOUS

PDF

79.1 KB Created: 2021-02-18 13:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2177dcffbb6452303e85e6b011086e10 SHA-1: afd8f00cf6dbfe31b990d8d7271ade11b0adb8ba SHA-256: c5f11c7bf8fbf5288131621b76d5bde33a119195c5e3cf1901f6ca3e9af0aa75
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://jottigo.ru/wix?keyword=basic+cooking+terms+answer+key PDF link annotation
    • https://cdn.sqhk.co/xamowizaso/gghjiBL/download_game_cut_and_paint_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderimi/jglFHjb/good_slice_of_life_anime_on_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/7jbjjyu/pugasoxiwanixijozomifur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5ffcb45488f99.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/eJgcijS/28223280433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5fe526835a645.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/dhgv6sN/ninezirowugabamexozixuboj.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/2838741.pdfIn PDF document text
    • http://dobikan.22web.org/bepofedisaxapax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465707/normal_601a03fcaa709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_601a42acdce33.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/AYieiMu/peacemaker_lobster_crab_co._tulsa_ok.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/hfghiaP/xegel.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/fjhhzEF/rainbow_dust_metallic_paint.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/cghghdG/lemon_crinkle_cookies_frugal_mom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibusobi.epizy.com/exceptional_learners_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/dhakad_chhora_song_mp4.pdfIn PDF document text
    • http://pibanifadedo.epizy.com/c_d_a_c_full_form.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_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 5392 bytes
SHA-256: aeb7d0c47e778cb3ca9ad2b39889a7fd2a4d11bb0b68d95274c89639e32cb7b5
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10480 bytes
SHA-256: b4035b7d47ae83ecc20aa641c989797a5959a8c87014d7e599a56a2d681177da

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