Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a24befce674e2be…

MALICIOUS

PDF

74.3 KB Created: 2021-02-16 23:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b39370b8985e34a5b46519a74ec251a8 SHA-1: 5fd7c62aa0819adc4d643b8137a92e2d1253c81b SHA-256: 8a24befce674e2be1373af634204e892f788183b93ba07196809394678c2ba8b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting and potentially malicious domains, suggesting an attempt to distribute malware or conduct phishing. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=laughing+skull+rep+guide+bfa PDF link annotation
    • https://cdn.sqhk.co/tabuguran/YNkgeif/nasa_logo_vector.pdfIn PDF document text
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/kanovedulidilepem.pdfIn PDF document text
    • http://vebejisidag.66ghz.com/lukuxuzalaxumaparotezuj.pdfIn PDF document text
    • http://takipleskazan.org/journey_to_the_west_series_2011u29oq.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/3840426.pdfIn PDF document text
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/siroseguribun.pdfIn PDF document text
    • https://cdn.sqhk.co/jafipago/ojeOS4r/popular_ringtones_for_android_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/3jdiips/usb_connector_pinout_price.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/7225963.pdfIn PDF document text
    • https://sonoredepi.weebly.com/uploads/1/3/0/9/130969061/xodevodiriwikelave.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/d24a87ad2.pdfIn PDF document text
    • http://zufabud.22web.org/you_again_full_movie_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/haE76jg/28926226683.pdfIn PDF document text
    • http://xabisafeb.22web.org/tikutidi.pdfIn PDF document text
    • https://pexefosakojoma.weebly.com/uploads/1/3/1/4/131406105/jofigelo_sefanepizitedoj_sidonu_lisekujogosir.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/g1fBJEE/58306670531.pdfIn PDF document text
    • https://vepifedufonun.weebly.com/uploads/1/3/1/4/131454255/7838246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigujirew.epizy.com/google_sheets_add_ons_missing.pdfIn PDF document text
    • http://puvusevakap.epizy.com/wegebumi.pdfIn PDF document text
    • http://pipinodojo.epizy.com/hello_bixby_apkmirror.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/10785568566.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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5448 bytes
SHA-256: 6821a9396516972a62ca7b478ffe10471e6caaccbb19ff626e323decac129156
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10824 bytes
SHA-256: 5a6de63c0f14dd7e5e7d3f12bc6a5f9a06bb687754c6321c9732f2c5e3a5516c

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