Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf96ef0b5643dee…

MALICIOUS

PDF

79.8 KB Created: 2021-02-19 12:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a25968f58e0a0ab8d4236e73ceb34b1 SHA-1: 190d636eed9ecdb659345cc3806bece4ca6b393a SHA-256: 3bf96ef0b5643deeba1e5f596b90506b1024440919f16a4d9ba4f99882239708
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/412888.pdf.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=showbox+free+download+apk PDF link annotation
    • https://cdn.sqhk.co/widiroje/gfgdgfk/international_superstar_soccer_2000_wikipedia.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/412888.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/jeBjejf/53875297103.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/city_of_ashes_movie_201915y24.pdfIn PDF document text
    • http://creamspait.xyz/giwosudafitajiluhloxz.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/zilaneboxanusikuse.pdfIn PDF document text
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/duwozasizuwob-kilisifugul-bovarexapub-bufekigubeka.pdfIn PDF document text
    • http://komamoj.22web.org/vaforez.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/bjjBLyb/bubble_tea_smoothie_near_me.pdfIn PDF document text
    • http://prizinsta365.website/tebifugurakepuninupixdeft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/xiaomi_aggiornamenti_android_10.pdfIn PDF document text
    • http://juvokumepi.rf.gd/riluzudejasidibavil.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/85521919100.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/rediwegixoritowifolo.pdfIn PDF document text
    • http://ninovaxabax.epizy.com/output_voltage_transformer_calculator.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_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 5416 bytes
SHA-256: ae4bda217926ae04eda3fbf8eb03cf6f4edc2343e6e438f5e18ef83732bb5f83
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 10256 bytes
SHA-256: 7661bb93a77b58694d273fdda1f92a30c6bda7d996c5324fb557321a12e36f0e

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