Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaa2c06ce4d2648…

MALICIOUS

PDF

73.0 KB Created: 2021-03-10 17:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd6e0c04d8aa37e01b1fed75abe45182 SHA-1: 9caccc5669e25c520bb7678e3225af25c0c9cba9 SHA-256: cdaa2c06ce4d2648226b8c173c2b6a76017f6dfde752510ea1da73c1457b9c71
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://mezovuduw.ru/award?keyword=autocad+elevation+plan+pdf PDF link annotation
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/gewenafe.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/formula_del_acido_cloridrico.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/wigotogamidif_lozunonububi.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/fgJGjdC/4570222033.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/what_does_classification_of_word_mean_in_root.pdfIn PDF document text
    • http://jinoxiresajigeb.iblogger.org/4k_hdr_tv_buying_guide.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/gulelogivixagoxeko.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/EuhcghR/rokanipofela.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/all_formula_of_maths_class_10_cbse_download.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/christian_hindi_prayer_book.pdfIn PDF document text
    • https://fijuxibafituwu.weebly.com/uploads/1/3/4/1/134109117/gilebizup-rogixuk.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/cggGggR/anthem_of_heroes_mods_steam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fulisawuxulinis.rf.gd/bogie_suspension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53ee71f-38f4-4a04-b565-48501b6e0f6e/xugobefipob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a80e6e3-8b56-4368-ab4e-90dd907265c1/garmin_nuvi_750_battery_replacement_instructions.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/cuanto_es_100_gramos_de_mantequilla_en_ml.pdfIn PDF document text
    • http://ditiziwux.rf.gd/cal_king_bed_sheet_sets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d04d49c-9e63-4f47-8cda-80ea72f9362c/27748912090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457ea128-c9c2-42a1-9354-628250ad1aa2/88303270608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46802717-b789-49e3-a47e-679f3ddcc6b9/94550553349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890670d7-3159-470e-8630-be79267a062c/viluxulovebomevilewodedar.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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 4924 bytes
SHA-256: 55117a09624bda7be9307f415959e548f6d3a538d14450b1cc84f63084d1a28a
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 9972 bytes
SHA-256: b04459693a3974c25d316908dcbdaf6362ec7201e2022c634f8492b61101dcab

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