Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f12b33efc1104f…

MALICIOUS

PDF

79.4 KB Created: 2021-04-04 07:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aac7d6cdc787ef18f251e7d8d94e8677 SHA-1: 53e7a14bf3a27670734a0573705ffae9fcb09cdb SHA-256: 79f12b33efc1104f67e7b9d34db699becf36dae34cf61cecd8b32d7df65c42ec
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-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://kuzutuzo.ru/strik?utm_term=how+to+use+graco+click+connect+car+seat PDF link annotation
    • https://refefutetolesom.weebly.com/uploads/1/3/4/8/134868450/jeduxegafesawetugi.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/siemens_automatic_voltage_regulator.pdfIn PDF document text
    • https://zupedadozox.weebly.com/uploads/1/3/0/7/130738974/pexigugeginudit.pdfIn PDF document text
    • http://luwakixifotizim.iblogger.org/ralagubiwafenana.pdfIn PDF document text
    • http://xunelifamu.iblogger.org/69984005040.pdfIn PDF document text
    • http://fuzabura.sportsontheweb.net/3816986147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuduzukatej.epizy.com/manuale_casio_cdp-_200r_italiano.pdfIn PDF document text
    • http://molezegifa.rf.gd/how_to_treat_bumps_on_your_lip.pdfIn PDF document text
    • http://wiwawilif.epizy.com/moxabimugabomufi.pdfIn PDF document text
    • http://fewodekikagusag.rf.gd/cantilever_bridge.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/jipid.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_6b99d4c7d62d4beb9fe1eb28df24f60e.pdf?index=trueIn PDF document text
    • http://xatidewivi.epizy.com/gujisig.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_bb6130bd077144fda6f63a41bcb7d5db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/best_call_of_duty_games_for_android.pdfIn PDF document text
    • http://xodezuraweba.rf.gd/86896201029.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/50072053953.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_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 5084 bytes
SHA-256: 9d312dbefe77ad49001ed3274a47662b1cff6090165b18d3d8da79b7df74487a
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10944 bytes
SHA-256: c74951521675c1e2a113ccae00ec00e67a115271e650ae05b36f460a0c90dc86