Malicious PDF — malware analysis report

Static analysis result for SHA-256 25705259328756a3…

MALICIOUS

PDF

46.9 KB Created: 2020-03-23 12:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2cfa685cef198359bd58c82a9463073e SHA-1: 3d9326d82ed13831010f76cab66d583dd60cdda4 SHA-256: 25705259328756a3ba9655bf7d1e1dccdbed73bffd139ee562e8c310617ef128
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to 'libros cristianos evangelicos para jovenes pdf' and references the wkhtmltopdf tool, suggesting a lure to these external sites. The ClamAV detection as 'Pdf.Dropper.Agent-8936854-0' and the ML classifier's high score further support its malicious nature, likely as a dropper for further malicious content hosted on the linked domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8936854-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8936854-0
  • 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 http://alwaysglams.com/uploads/1/3/0/6/130621852/130621852.html#libros+cristianos+evangelicos+para+jovenes+pdf
    • http://mosaicdata.net/uploads/1/3/1/0/131070501/8635484.pdf
    • http://www.stunningsphynxkitten.com/uploads/1/3/0/5/130550976/wuzoj.pdf
    • http://www.com-online.dadgifts.us/uploads/1/3/0/2/130287934/roxin_nupuzuvegitoba_semulo_gunekapitiro.pdf
    • http://distroteq.net/uploads/1/3/0/9/130969879/7902ea8.pdf
    • http://deeplyrootedtv.org/uploads/1/3/0/5/130544303/5677429.pdf
    • http://growerschoicebank.com/uploads/1/3/0/9/130969389/0aac0048ed.pdf
    • http://christchurchportland.org/uploads/1/3/0/7/130739000/2379209.pdf
    • http://cpfullerton.com/uploads/1/3/0/8/130874015/sakomiki.pdf
    • http://missitbeauty.co.uk/uploads/1/3/0/4/130489080/c118969.pdf
    • http://www.fatherpandero.com/uploads/1/3/0/8/130814286/tifaravovizibilov.pdf
    • http://www.pureimage.studio/uploads/1/3/0/8/130874475/2495229.pdf
    • http://www.clutchadministration.com/uploads/1/3/0/6/130620337/wapitivanebam.pdf
    • http://odempsey.net/uploads/1/3/0/5/130588708/raropanomuzebav.pdf
    • http://krackerjackskennel.com/uploads/1/3/0/8/130873937/tuzon.pdf
    • http://saborunico.shop/uploads/1/3/0/4/130476024/8892413.pdf
    • http://victoryit.info/uploads/1/3/0/6/130621457/vuvasibomopuvux.pdf
    • http://www.eco-star.co.uk/uploads/1/3/0/6/130639228/zadazoxamalewe.pdf
    • http://www.donewithdoubt.com/uploads/1/3/0/5/130551656/dolubukawilavarerugi.pdf
    • http://cpanel.succeed.hk/uploads/1/3/0/2/130272937/lunibakutadararaze.pdf
    • http://felinebehaviorinvestigator.com/uploads/1/3/0/8/130814448/2019629.pdf
    • http://wingeyecare.net/uploads/1/3/0/2/130289668/8809812.pdf
    • http://gracechurchhouston.org/uploads/1/3/0/5/130589998/defea.pdf
    • http://ccocciboutique.com/uploads/1/3/0/5/130589287/xusozuluxixeg-gufula-wiwox-nafijo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008034.bin
1823a153a1e52a4b0e3c324ce65ea0bb5bf59a21d836aa7c60d8d7491dacf1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8034 9968 bytes
font_01_sfnt_off0000a374.bin
b0a6a33381002d1c379ca931d660fe98df7a73518421c8b234b9dc16af60e95a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA374 2696 bytes

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