Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18aff4f58b40707…

MALICIOUS

PDF

82.4 KB Created: 2021-04-30 19:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 03d122ebaef9a525cab8a649905f5491 SHA-1: b1ff0dad642a24cfda490856cd5e0b5a1da3ba44 SHA-256: b18aff4f58b40707b0522aa75930da5c021fe2cd09f5f638465c42bb868ab5b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent URL pointing to a disposable domain and employing UTM parameters, suggesting a phishing or spam campaign. The PDF's content appears to be obfuscated or corrupted, but the presence of external links and the overall heuristic firings indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=is+volcanic+soil+good+for+farming PDF link annotation
    • http://chambre.xyz/tuzed6uzp2.pdfIn PDF document text
    • http://zeropium.com/faxabalovumovidovl9m.pdfIn PDF document text
    • http://dithetsen.xyz/the_martian_movie_worksheetzx6gl.pdfIn PDF document text
    • http://nubolutlion.xyz/high_yield_biostatistics9l6jp.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/blood_groups_file.pdfIn PDF document text
    • http://o-karte-kopilka.com/695566587426lsm8.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/calculus_single_variable_8th_edition_solution_manual.pdfIn PDF document text
    • http://good-production16.site/maytag_bravos_xl_mvwb835dw_washing_machine_reviewlct7y.pdfIn PDF document text
    • http://fajamad.mypressonline.com/15071104191.pdfIn PDF document text
    • http://fimewot.xyz/cisco_re1000_setup_cdhh8kw.pdfIn PDF document text
    • http://deflecfcvy.best/22068551427499mk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5105fb9e-f6a9-45b2-8acb-cbe81149817d/2003_ford_focus_battery_cable_replacement.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/domestic_violence_act_kenya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3e2854-2f9e-4aa3-8d0c-37af053f88e1/ti_30x_how_to_do_exponents.pdfIn PDF document text
    • http://felugibesixe.onlinewebshop.net/estado_nutricional_definicion.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/characteristics_of_communication_channels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac58796-80fc-4137-8f71-31699d5805be/46472842537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced5ec58-1ca1-49b1-b94c-3ca5afc6153f/genie_pro_screw_drive_no_learn_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d20df8-252b-4efa-b150-eead81e663d2/fibabozujuxuwakiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7964d9a0-cd7e-4fea-b0be-18a03cceb3b7/lomomusejiwaxitilif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2543fc0e-d3ad-4886-8170-8e9267d4042f/what_does_henehene_kou_aka_mean.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_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 5340 bytes
SHA-256: be7ef24f6a5a6ffdc0a21b617041f3e4be28f7bbb3ea636e4055d055fa0649cd
font_01_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 10984 bytes
SHA-256: cfafadf8aa9fe7bd358cb8021ef8eef1d6c018bd5449552da7baf7f4b4487bc7

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