Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75b67f8e9bd6855…

MALICIOUS

PDF

76.7 KB Created: 2021-04-11 17:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 36ffde11eacefef0a8dc28ef90d5db6d SHA-1: 14898d736636c6fe043bf3929934a3ed9bf2596f SHA-256: f75b67f8e9bd6855314e77449d0480f84b6a7d44d906a224786edeffb86e804d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely used for initial access via spearphishing.

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 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.
  • 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://seumenha.ru/strik?utm_term=calculus+textbook+answers+finney PDF link annotation
    • https://cdn.sqhk.co/pozuwifofub/b0QjiaD/31169717105.pdfIn PDF document text
    • https://jabidezojofur.weebly.com/uploads/1/3/4/0/134096838/57f5ce4841.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/ehd1ieX/mini_wood_cutting_machine_for_home_use.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/scRgg9o/free_download_puzzle_bobble_games_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/9iaajjs/senam.pdfIn PDF document text
    • https://lofokuvowuvi.weebly.com/uploads/1/3/4/3/134362742/bixawirorubipuvinika.pdfIn PDF document text
    • http://eeeeeyyy.space/58676932225ww7wg.pdfIn PDF document text
    • http://xovumajinobog.iblogger.org/bepimesozawagadak.pdfIn PDF document text
    • https://nuwomanat.weebly.com/uploads/1/3/4/6/134664603/didazakuwiruv_zapixaja_sawaboloboni_zurewusib.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/tanifomekamusesu.pdfIn PDF document text
    • http://firstflirts.site/kexobafitisuzakukotisog17bs.pdfIn PDF document text
    • https://zevugakarexavak.weebly.com/uploads/1/3/1/8/131857252/003f1417f612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rorives/simple_music_note_tattoo_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35a22d8-5d0f-41ea-9e11-81aee2167d3f/chicco_bravo_travel_system_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/angular_reactive_form_reset_example.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/59940370445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125a0382-3737-4ebc-98fc-54c0fd9c1130/what_is_a_meet_and_confer_in_law.pdfIn PDF document text
    • http://nuzabasere.rf.gd/importancia_de_la_alimentacion_en_el_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/balloon_horror_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/mabeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3f9413-ba76-4d0a-b6a4-6e9c158017e4/does_a_rental_agreement_have_to_be_notarized.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 5248 bytes
SHA-256: a318a22e9992014383fde00441f7a144b320303aa65fa5eb93d95f41a4d52cb4
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 11672 bytes
SHA-256: 2e9ffd8cead98d55a5a5fa1af4e846fa6626ee536ea2427ed84ac2ad489c0878
font_02_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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