Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3872120d70e8f63…

MALICIOUS

PDF

83.8 KB Created: 2021-03-01 16:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3008c6fa01637db87644fc468ccfd265 SHA-1: 530e1f1730f591c570624f00192263dba6ba4e8a SHA-256: d3872120d70e8f63c77b861176bf961dca7f53cc1ac22b20c66c8b635adcb0e9
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 0.9998

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://vilenefex.ru/123?utm_term=how+many+calories+in+a+slice+of+margherita+pizza PDF link annotation
    • https://cdn.sqhk.co/buvaboda/hdXjehd/free_robux_website_no_offers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fee623aa2915.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/hjf3HeW/51766138337.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/iiOjhif/61221282170.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/uMieAji/zugipoliveriki.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/7696551.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/mr_heater_big_maxx_80000_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/konosoka/hjih2f2/insta_beauty_photo_editor.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/bose_companion_2_iii_watts.pdfIn PDF document text
    • https://cdn.sqhk.co/wepenujofow/FicBgiz/zibul.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/bgd8Pic/49793793510.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/lepazufuwe.pdfIn PDF document text
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/8e4113d2.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/vuxagixil/96034188778.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/zusitokemoj.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/61083946540.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_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 5420 bytes
SHA-256: 4b0052bf9ad2691bc2365cfbd756cff696b1e3f4ac2edfa16a35d1f1f630ae17
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 11096 bytes
SHA-256: 573178abb07127af6da4a0e87a3f62038bc6f9bdf7e01afcf32a7a65e51f4847
font_02_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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