Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a274b2ffec518…

MALICIOUS

PDF

84.8 KB Created: 2021-03-17 21:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e2c5f74a05f07795208c8d8cdd0ca84d SHA-1: a4bbdb07ca44d31a200f2b3215be1586bfe8d08b SHA-256: 139a274b2ffec5189e272dccd457eeb6cfaaec7adc1b22273d0c5aa0d1159ca4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of external URIs and the link farm heuristic point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/wix?keyword=call+of+duty+world+at+war+nazi+zombies+download+for+pc+free PDF link annotation
    • https://cdn.sqhk.co/fivukidado/jgig6ig/one_punch_man_volume_1_limited_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/gfZgdIJ/woxonavimukuzamijo.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/Bshcngf/lunakasebuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/bijOgid/swimming_pool_flip_diving_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/bM0jjIW/bubble_shooter_legend_hack_download.pdfIn PDF document text
    • http://pebogoginugi.iblogger.org/fagekopobe.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/0khejia/10132029746.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/7L5YifK/kumanijokojajiponekokipo.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/organic_chemistry_as_a_second_language_4th_vs_5th_edition.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://uploads.strikinglycdn.com/files/526822b9-233c-442f-a3c4-da04af28e9e1/what_is_the_roman_number_of_5001.pdfIn PDF document text
    • http://xoxiposewarewa.epizy.com/environmental_impact_assessment_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc61074-6f8f-4495-81f1-a3ead43c3daf/lesaxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893bde6e-c701-405f-a577-2a8018d197ef/difference_between_evaluation_examine_and_assessment.pdfIn PDF document text
    • http://wepezip.epizy.com/mezexasinomew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61977fc-01ae-442d-bc00-1cc6357a757f/best_way_to_lose_weight_while_strength_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c32b9d-1063-4e08-8d40-87ae1bfe1980/10698607737.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/11697172007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c3ffaa-f45b-4d97-bdf3-41f4d0737799/gowutuxemunid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40331f7f-3c60-4de3-afee-ca7d155810a5/58231950947.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/section_138_of_negotiable_instruments_act_latest_amendment_2015.pdfIn PDF document text
    • http://mafonevaverazux.atwebpages.com/vilomisasuv.pdfIn PDF document text
    • http://pigadupujegojum.rf.gd/75131712043.pdfIn PDF document text
    • http://fujusup.epizy.com/cds_1_2020_syllabus_download.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_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 5592 bytes
SHA-256: 01fda9a569c76979a86ad9350c52dfe9bd6fd02985329f9b60e8a0af6fca2f33
font_01_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10972 bytes
SHA-256: cece7c8f5dd337a25730a9a3f556f3527ea5bad7fd4024040cf5bbe0e909d950
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361