Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c43e42cccf2fe6b…

MALICIOUS

PDF

75.6 KB Created: 2021-04-05 16:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce54e39483f617406c0f975418e2c7ca SHA-1: 40df32bf21bf0f7de95f663629cebd57a04d8410 SHA-256: 8c43e42cccf2fe6bb62505fa612546e18bb39561c8ff6fd2ac9909277e046cbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, some of which point to potentially disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to contain metadata related to its creation, but no clear instructions or lures are discernible from the readable portions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cdn-cms.f-static.net/uploads/4446035/normal_6044a9f36a1aa.pdf In PDF document text
    • https://cdn.sqhk.co/siwosisagi/eacgjif/questions_answerable_by_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/zogaxokeno/6B9h7jd/bojosikitedajujinaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_5fd83281ed37d.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/gfifgeH/mapoleno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6017bb0a881dc.pdfIn PDF document text
    • http://juvugewit.iblogger.org/acta_neuropathologica_endnote_style.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6013a6867b09c.pdfIn PDF document text
    • http://fomimobevab.22web.org/taluxixijoralewudi.pdfIn PDF document text
    • https://cdn.sqhk.co/lasukojizix/dgfidcC/push_and_pop_up_toy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=how%20to%20set%20up%20panasonic%20home%20phone%20voicemailPDF link annotation
    • https://s3.amazonaws.com/vekodupiwarobi/kasareneti.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_a879e09d0c954f6ebf18a9a725589f25.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_c957e0d945c2431b8c4c2f74e2e7b4a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/insurance_certificate_request_template.pdfIn PDF document text
    • http://pazegopa.rf.gd/lefesazuzapuro.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/wonisipalebibajafezinobi.pdfIn PDF document text
    • http://nozasunagon.epizy.com/14558710475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de072d7-acc0-4a6f-ae86-c34c5d3a1ad7/percy_jackson_sea_of_monsters_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/vofolatupud.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/romance_of_the_three_kingdoms_14_nintendo_switch.pdfIn PDF document text
    • http://vedujekobizu.rf.gd/nofotimet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e763c5f3-85a1-4bfd-a1b0-4e6809402d01/pathfinder_hells_vengeance_review.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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5188 bytes
SHA-256: 0d53bb5472c92eb779da3a61aa03aacd48ddd41ac8a3a8d6d70777f40b480e12
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 10884 bytes
SHA-256: c11a63dbe7c21897550f823b09bcc2ef5f2bb514e7055cbec32fa765b67a4a19

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