Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f7901a57d7c4e4…

MALICIOUS

PDF

96.9 KB Created: 2021-05-17 19:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 23808e7926613f9adb6cb2e923460d58 SHA-1: e58d109b5c07960d73f1cfde4687c42d78af4ab7 SHA-256: 16f7901a57d7c4e410c1720fbd90b4feb78ae58d6649ee81f14f7629d122278e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to job searches, suggesting a lure to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=mechanical%20engineering%20jobs%20seattle%20entry%20level PDF link annotation
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/a57c6130fdb30.pdfIn PDF document text
    • http://gratoram.site/betty_crocker_picture_cookbook_first_edition_third_printingart18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_604981286d191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5fe670b224c03.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/vufotu.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/e7cfe.pdfIn PDF document text
    • http://alteramaks.world/calories_in_arbys_french_dip_without_cheesebiyg4.pdfIn PDF document text
    • http://budujene.iblogger.org/tiwufigawag.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/good_books_on_history_of_islam4y7se.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/2c5a6.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/remebasas.pdfIn PDF document text
    • http://povar2020.site/boa_christmas_running_shortso76ij.pdfIn PDF document text
    • http://kismykeitio.best/83914571734yw6mx.pdfIn PDF document text
    • http://debegezuvume.iblogger.org/gibidukokokex.pdfIn PDF document text
    • http://bomesirosik.22web.org/medical_certificate_for_josaa_counselling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobupeg.rf.gd/kukupoxawa.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/kangna_tera_ni_lyrics_song.pdfIn PDF document text
    • http://bosirizowu.rf.gd/99727355397.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/xonuvuxupujikolatok.pdfIn PDF document text
    • http://bizaludewop.epizy.com/amplifi_tt_alternative.pdfIn PDF document text
    • http://zitabuzujo.epizy.com/medical_english.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_off00013ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 5444 bytes
SHA-256: a3c1aa43a227b1e473ffce7a89c8cbb9f0ece41fdb63addc1efa140954c799b5
font_01_sfnt_off00014f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F39 11444 bytes
SHA-256: e232def0eee212fe73abdfc6e4529419a1f6d1d546237e783c9998ce0df8bfb3

Open this report in the interactive analyzer, or submit your own file for analysis.