Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63dc42b10c0bbd9…

MALICIOUS

PDF

82.2 KB Created: 2021-03-18 00:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8062af8a4ead316855dc463757a3df82 SHA-1: 5b445e77e74ae294fd2471252f7682e31f783327 SHA-256: d63dc42b10c0bbd95769488e59f9a6a8d75211d9790f7b2eba1925450a23fffb
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to contain search-related keywords, reinforcing the lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=how+much+is+used+samsung+s9+in+nigeria PDF link annotation
    • https://cdn.sqhk.co/ledumixifer/dMjdibv/88196390545.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/baby_gate_for_stairs_with_curved_banister.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/85699169878.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/egiRghF/huey_lewis_power_of_love_karaoke.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/oSt329Q/hd_audio_songs_free_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/SFgguie/tilafodebikeso.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/jftCChk/telkom_mobile_please_call_me_ussd_code.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/business_plan_book_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_b164b12f594d4affadd29c4cbf48cce4.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_1ac14076f5774593805fd84a4364a18e.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_fae609d685494539bc5f3abe3ef92188.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_a7be2979cadc402cb5e54e4729048f56.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_4e16fb42547842e3a0cf8b9dc2b68f7c.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_2552e385d174430da83ca79a728fe4ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/rebibilabevu.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_d39dcae4d0db47d1a7c7753f70c75e65.pdf?index=trueIn PDF document text
    • http://dezinolabebosod.atwebpages.com/todedolitekapa.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/joker_murray_dialogue_script.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/libulobiv.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/javavijek.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_db07f53b890d41f098460f1521cd0d4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/surah_yasin_with_bangla_pronunciation.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_5bb729a52dcc4bb2802ff7bd37111e3c.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_529404529a96480fae9b225cfb4bca42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/kg_cardboard_sheet_design.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_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 5532 bytes
SHA-256: d6e71ba4030065c4d5a047f7434b55bd058ca0042e3b976ac2a88b98302f8a61
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 11168 bytes
SHA-256: dd848a75c4ad12d9e0f7215947b9280a85581c56cbb2e0c985e17290d734db60