Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4df1d588cd06c7…

MALICIOUS

PDF

81.4 KB Created: 2021-04-10 12:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3db142e1f290f6932beecfefa8a23377 SHA-1: 53143add56b7f0e16c5b0444870a7114e7598450 SHA-256: 9a4df1d588cd06c7e0197d447061ec103bb338aaba0192dcfa50ebd80b4042eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://pelibifir.ru/strik?utm_term=math+worksheet+for+grade+3+multiplication PDF link annotation
    • https://cdn.sqhk.co/jisepozidis/3f0Yhim/very_funny_short_videos_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/Uhgie04/bojowefuradeve.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/nudesofiziz.pdfIn PDF document text
    • http://tojoxurosi.22web.org/vebugimaxenemumev.pdfIn PDF document text
    • http://sefesojobibif.iblogger.org/piwutu.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/scjmijR/41600931371.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/4918070.pdfIn PDF document text
    • https://webesamogamafi.weebly.com/uploads/1/3/4/0/134012635/fizuwimomorawosira.pdfIn PDF document text
    • http://puxeguka.iblogger.org/baba_yetu_score.pdfIn PDF document text
    • http://bimoxalobabi.iblogger.org/probabilidad_y_estadistica_schaum_cuarta_edicion.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/5e3d387f-fe36-4352-ab58-a084c4c29d79/depazexelofebifedixabiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0563e6a-e408-4830-bac2-9e0930ed19dd/mitsubishi_mr_slim_r410a_cost.pdfIn PDF document text
    • http://femagela.myartsonline.com/97929382045.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/lokipozipobinamuj.pdfIn PDF document text
    • http://nojumajemipi.rf.gd/a_practical_english_grammar_combined_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c966e5b0-38a8-47c6-a171-eed81b07230b/ti_84_calculator_emulator_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/easy_keto_recipes_for_beginners_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/how_much_does_a_gearbox_rebuild_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35957542-ff43-4b1d-857b-06f6434b46b6/kokeve.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/star_wars_unlimited_power.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/56843480789.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_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 5896 bytes
SHA-256: c478b01bbb8acb513045e8903e0c2dc865cebedafb8c393c1fe54f2a4877a21e
font_01_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 10884 bytes
SHA-256: 40834a0fc440ed52b5823683ddda3a4648b20814d9cdea997d9f09161ad1a903

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