Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aeaa9bce967559f…

MALICIOUS

PDF

71.9 KB Created: 2021-02-18 13:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82052685ae30061623643602cb20e635 SHA-1: f211b03a93546e7ec59202f4709ab90025543a4f SHA-256: 1aeaa9bce967559fdacf9a462e17160936c3e7afa3bdfd53266ebb3e5dbe7c81
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to disassembling a fan, designed to trick users into visiting these malicious links.

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://leonvi.ru/aws?utm_term=how+to+take+apart+a+honeywell+tower+fan PDF link annotation
    • https://cdn.sqhk.co/kerutadit/ojadBDL/10159101801.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/tagufemix_wonino_jisopafa_jasopejog.pdfIn PDF document text
    • http://znasila.ru/27106772880heo8q.pdfIn PDF document text
    • http://ita-yog.space/tiddy_bear_comfort_strapmjs3t.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/684jfie/minecraft_pocket_edition_game_free_to_play.pdfIn PDF document text
    • http://tryici.xyz/meguxudesazefesi5ripk.pdfIn PDF document text
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/ximotadoram.pdfIn PDF document text
    • https://detofupupe.weebly.com/uploads/1/3/1/3/131384021/metivefevulibob-sakenevib.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/i0jgCNe/movie_maker_10_pro_free_download.pdfIn PDF document text
    • http://cashfree.store/cosmology_jobs_ukiwm3v.pdfIn PDF document text
    • http://krepezh.guru/college_major_and_career_assessmentod90z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogozibopuxut.epizy.com/bofosogow.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/love_yourself_answer_bts_album_buy.pdfIn PDF document text
    • http://bireses.rf.gd/jebepimikedolurem.pdfIn PDF document text
    • http://jominata.rf.gd/app_lock_fingerprint_password_pro_apk.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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 5028 bytes
SHA-256: 8f03558032b9c5c730f3e70a939cc2c6f86df314eb8b05a15f82c02032669d35
font_01_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 11200 bytes
SHA-256: 560c55a09178e13686e8de53ee66b7f057cf55d5b0b87b3970b12352922ec16b

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