Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0766d473a48ec50…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 11:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 439d94966072560aaf0ca0b8bd0e533e SHA-1: 92fd6d63050f5ce1002997d2623f9750fd43ce15 SHA-256: c0766d473a48ec50cf795528ae5d53ac29b48239f3e1cb57e9bf330d3f010edc
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://zajinet.ru/123?utm_term=ac+market+pro+apk+ios PDF link annotation
    • http://vipmanmarket.space/53164565612imdzy.pdfIn PDF document text
    • http://freds.space/wodegikigujiyj1li.pdfIn PDF document text
    • http://vengriya.space/69319152571stway.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/tdqhchi/52941386320.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/BLKhhp4/international_business_salary_per_month.pdfIn PDF document text
    • https://lerofazoneku.weebly.com/uploads/1/3/5/3/135314691/92d3194f710b2c7.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/5hc7jdW/29228811436.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/d1313cac2b9.pdfIn PDF document text
    • http://myfavoritesun.xyz/829940331775t8i5.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/haqBAjc/ps4_emulator_games_download_iso.pdfIn PDF document text
    • http://clebohets.xyz/larson_calculus_textbook_answersd5jtd.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/YsBiihi/hashtags_to_use_on_instagram_for_likes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faleferesevo.onlinewebshop.net/sadup.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/brewster_beacon_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d701b7a-cf13-4880-b375-9f12cac477aa/88907955721.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/32841700461.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/java_8_openjdk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880a7b35-7502-4867-9ead-da2801e6d162/90656944575.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/xomejelupoviwu.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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 5100 bytes
SHA-256: 8337aade3ee34384f0975ae1b9270153422e03843d554a21a2a88e6e78a2fca0
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 11120 bytes
SHA-256: 799fe4cf2c9528d8d85f6aeb3a50f8244c86994f35136b20863800fc5782f06b

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