Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e22b105c5541bf2…

MALICIOUS

PDF

77.3 KB Created: 2021-05-09 21:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0434e5520793412901065b102f2ffa50 SHA-1: 7f7461ba82a9a6f1293f4ec1031cfcee5c847314 SHA-256: 5e22b105c5541bf260c810293f8131566ac91dbf35ceaff8a968c3233b4ef2d1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or spam-related domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam campaigns. While no scripts were directly extracted, the embedded URLs and link farm behavior point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/wb?keyword=rikki%20tikki%20tavi%20full%20story%20in%20hindi PDF link annotation
    • http://jedusajinud.mygamesonline.org/what_is_the_difference_between_exposition_and_narration.pdfIn PDF document text
    • http://takinowusef.iblogger.org/vapour_absorption_refrigeration_system_using_solar_energy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_60067f3a6c214.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/foscam_fi8910w_installation_software_download.pdfIn PDF document text
    • http://lulumel.66ghz.com/19932501117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5fd15bde6f8a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farowug/chiari_malformation_post_surgery_complications.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_094503f0eb09409fb6f8dbffa4071a4b.pdf?index=trueIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_db9b35822b6b496fa164da163794891b.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_5ab3a75f33f44d82842472a33ff41758.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_328bba9e196c430bbd615fb78113123d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/is_a_masters_in_management_information_systems_worth_it.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/beauty_and_the_beast_original_book.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_b8b5df3ec3714a8d86ab410aca54a7b7.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_7a850514883c4b4bba6142bb3ce19d70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/1652976883.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_bf54000c5724493b9b1b6c3aad0dc2bb.pdf?index=trueIn PDF document text
    • http://fukorow.epizy.com/bouchon_lyonnais_guide_michelin_2018.pdfIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_6ec72a93fb484364b3395b69863cd30d.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_f84736c8622b4b3fa848befe1cfa8439.pdf?index=trueIn PDF document text
    • http://pedamodaw.onlinewebshop.net/c._p._c_bare_act.pdfIn PDF document text
    • http://derizarage.epizy.com/5_love_languages_for_singles_printable_test.pdfIn PDF document text
    • http://lizidilefigeg.epizy.com/11332739118.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/44786051148.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_3c39e8ef96ad4d51901fbc05abcbc4f8.pdf?index=trueIn 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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 5228 bytes
SHA-256: e206ccd3a31cede7fe6258528d26ee019e15358c00d7a215601144b11bbc210e
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 10672 bytes
SHA-256: 9207fecb8845b482f66ec20d18f069fc0c94f91876100f59dbeb7a77abcc8f35

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