Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70487f7c1ee1750…

MALICIOUS

PDF

73.0 KB Created: 2021-02-14 12:35:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e745b86a7c7d04722655282307c93199 SHA-1: 987180c03810083e4d10cfc2e42de9b3d79f7894 SHA-256: c70487f7c1ee17502b59853fbd58c0412c49dbf5cd947739744f7b11368ccb20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=cucumber+sandwich+report+jar PDF link annotation
    • http://dikuziropuviv.22web.org/zibufajiz.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/eoAHgcj/where_you_live_meaning_in_urdu.pdfIn PDF document text
    • http://pifesato.iblogger.org/castlevania_harmony_of_despair_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/ghjihbH/5456816884.pdfIn PDF document text
    • http://firstdoctor.xyz/free_photo_editor_iphone_78ryqj.pdfIn PDF document text
    • http://ndfnasg.xyz/pathfinder_summoner_guide9gmv9.pdfIn PDF document text
    • http://shtampshop.ru/beading_patterns_free19kga.pdfIn PDF document text
    • http://nuraner.iblogger.org/browser_mein_video_kaise_kare.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://s3.amazonaws.com/wezukep/fadiwitanarujamosubule.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/lokigokapejivufinanakozat.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/tukowerepikugakolak.pdfIn PDF document text
    • http://rasiritodir.rf.gd/aphex_twin_printworks.pdfIn PDF document text
    • http://dufexisoji.rf.gd/cancer_de_prostata_scielo.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/ak_47_punjabi_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/gmail_signature_template_student.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_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 5496 bytes
SHA-256: b435e721350a49e930bfd08920423739c3471379828646be49c8222899340451
font_01_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 11372 bytes
SHA-256: 75d89d5b30a244281e032cdc9e198d94c572ae7d6515f79425a1b54827ea8398
font_02_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e