Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dd424cd932058a…

MALICIOUS

PDF

83.9 KB Created: 2021-05-12 23:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 15a431ff5998423d2de45493782bcbdc SHA-1: 92538dce1d7b6cd905686b1b237316fa5cb40817 SHA-256: f1dd424cd932058a32e9f88a81459eec4fe16a1265bb5decba255d0c2604a08e
186 Risk Score

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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=how+do+i+add+more+buttons+on+wix PDF link annotation
    • https://cdn.sqhk.co/dutimapo/kiaijhg/vufadamisolevepinunebise.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/penizakezi.pdfIn PDF document text
    • http://glawerry.online/lactancia_materna_beneficios_para_la_madre_lactante3zkhm.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/waluvogowabixu.pdfIn PDF document text
    • http://cosmosqrab.online/34622433236q35ww.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/vados.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/0b83d014dd771.pdfIn PDF document text
    • http://iciapp.xyz/formato_de_carta_responsiva_para_escuela21fa8.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/lakebedimurosat_fipezakuf_fujudemen.pdfIn PDF document text
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/5213413.pdfIn PDF document text
    • https://cdn.sqhk.co/ponajadu/Tk5hdjg/hatsune_miku_tap_wonder_songs.pdfIn PDF document text
    • http://uggi-ugg.com/rasavipifabovinuneejxl.pdfIn PDF document text
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/tavevosafo.pdfIn PDF document text
    • http://flowerport.shop/adobe_flash_player_windows_7_64_bit_indir_gezginler5gl6n.pdfIn PDF document text
    • http://verifedform.com/homophones_worksheets_for_grade_4howbw.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/5vJlhaJ/vsco_bubble_letters_copy_and_paste.pdfIn PDF document text
    • http://klosheff.xyz/management_of_change_procedure_template5gawr.pdfIn PDF document text
    • https://xanalefude.weebly.com/uploads/1/3/1/4/131411596/9495501.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://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_bffa2a51f17d4fe9b82eafd16a8737c1.pdf?index=trueIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_b5136dc834b24ac3a6b6cc93abf4cb6d.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_f6abe6fff0f7488da842a594c777b51a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5080 bytes
SHA-256: 60b1829fd5c2ce267676601551f7f86579b0eca582831e19bcf35dd180633ef1
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 11156 bytes
SHA-256: ab87e0b9d656bbd2bf4da3fe68ccbec1b3a37437cc4a3280dfe4bc07f17d2107
font_02_sfnt_off00013427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71