Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aab0a68139148a…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 04:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f50878cadde54222463fb5744e7bdaea SHA-1: d93edc377cc4843e59cd33fe144494f1b4cdabc4 SHA-256: a0aab0a68139148af7d86fa3a2da7caba465034882c24b98da617596ad15e369
126 Risk Score

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 0.9995

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://maypoin.ru/wix?keyword=operations+of+rational+functions+worksheet PDF link annotation
    • http://buybritishcat.com/fresh_off_the_boat_idiom_meaningg3msf.pdfIn PDF document text
    • http://zuvels.xyz/stihl_fs55r_manualxw8jv.pdfIn PDF document text
    • http://leree6.club/11725114580om0oa.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/buug_af_soomaali.pdfIn PDF document text
    • http://razvivatel.blog/8622662560694s0n.pdfIn PDF document text
    • http://daliadiago.com/82795123468fumvb.pdfIn PDF document text
    • http://teksalle.xyz/297254353279ygok.pdfIn PDF document text
    • http://chambrely.xyz/33770539984fvkyh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todabopojexojad.epizy.com/how_to_pair_uniden_cordless_phone.pdfIn PDF document text
    • http://pavebutom.epizy.com/duxikonefusuwevulumosekiw.pdfIn PDF document text
    • http://safowuroxowafop.epizy.com/60875495475.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_4121fd787c474be4b3cca26ea6c857bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/auto_loan_pre_approval_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/nj_transit_child_fares.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/745334903.pdfIn PDF document text
    • http://dufobilubaxa.rf.gd/multiple_alleles_rabbits_worksheet_answers.pdfIn PDF document text
    • http://zikituxepori.epizy.com/18701322942.pdfIn PDF document text
    • http://penariziredalax.epizy.com/bacterial_genetics_by_snyder.pdfIn PDF document text
    • http://vesunak.rf.gd/feelings_and_emotions_vocabulary_list.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/zizuxunofefurisux.pdfIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_e5134003b4e44aa6b5cb6ef21f32409b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/budget_excel_template_xls.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 5288 bytes
SHA-256: 6652df843d2fd6d0425e06101a7e778ebd2f982c4a1c2a92237a887ae9cfd2f6
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 11484 bytes
SHA-256: 49a7add46f8053f57cee5f85f49b7b3fc1b2c5e34e1abec1fea4a5e138065a4c
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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