Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d0000087b2c002…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 10:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9468c7d28e937c7618b444d44d801507 SHA-1: 565461c05dad2f6ad848abfa4748f367d0031562 SHA-256: b1d0000087b2c00221c2f5bf94744d488eaf6cb49e73741ae719101e163a78b5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zajinet.ru/wix?keyword=kennings+poem+worksheet PDF link annotation
    • http://bexowobiminefi.mywebcommunity.org/aswath_damodaran_books_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_6030540985485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_6022d26a209b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_603ab3b74088b.pdfIn PDF document text
    • http://kemytbok.xyz/que_es_el_cariotipo_humanoun4hl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_6029859fcf589.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/regonexepuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6044fbfea6c18.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/did_quasimodo_love_esmeralda.pdfIn PDF document text
    • http://vanlit.ru/refegolonevunobibalxu9t3.pdfIn PDF document text
    • http://glossywp.online/subject_verb_agreement_intermediate83zgu.pdfIn PDF document text
    • http://vehicleusains.com/platos_the_republic_quotesg8wum.pdfIn PDF document text
    • http://construt.site/toastmaster_bread_and_butter_maker_model_1185_manual0tgsj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_88f849774daa4d93b1de5e786a00f3cf.pdf?index=trueIn PDF document text
    • http://nunenunewu.rf.gd/30037323713.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_3f114fc0da78426d91d68ff3229366ed.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_d2c996f67f6c4ac6b86789b6b04af827.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/adobe_reader_10_english_version.pdfIn PDF document text
    • http://delenujafoxa.rf.gd/humana_vitality_biometric_screening_form.pdfIn PDF document text
    • http://fomuzuzidoduvi.epizy.com/jinawirupujevazizavu.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_8b78e95f7e134dfbae6aa38e77572cdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizabo/what_is_the_purpose_of_essay_analysis.pdfIn PDF document text
    • http://wosolebaxuwutux.rf.gd/fijodow.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/clothes_worksheet_first_grade.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/livre_alter_ego_b2.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_e74f83ee38444935a9f86f8a8787b2bd.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_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 5116 bytes
SHA-256: 74a5ab23e279a6b647eb0d64a22e538a47cad098a19aefb1a98ae9e7e8ade82d
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 11048 bytes
SHA-256: c303a1cad745361175e5b9a6800c707b0e96d505e0451eef1353533dc8a4b581

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