Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7391de644327a9…

MALICIOUS

PDF

41.8 KB Created: 2020-05-15 05:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6485f7de1aca2c10294531215e037bdb SHA-1: f29b7cd1c1c055fb3cd2f9f19d38fac30424e889 SHA-256: 5c7391de644327a9408bfe3f13cca3681ce63178c2f7b68e6a0c21f18035eed3
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to external PDF files, suggesting a link farm designed to attract search engine traffic. The document body explicitly mentions 'Audacity apk for android phone', indicating a lure to download potentially unwanted or malicious software. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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 http://alpinepro1800.com/uploads/1/3/0/5/130589054/130589054.html#audacity+apk+for+android+phone
    • http://soivan.com/uploads/1/3/0/7/130739053/nujijoviwi.pdf
    • http://ubhari.org/uploads/1/3/0/7/130740013/libobomatuxetowonose.pdf
    • http://josephineshaw.com/uploads/1/3/1/8/131857626/geleturunevat-vonuwogo-fejolavotesemuv-vuzowele.pdf
    • http://amandaglathlin.com/uploads/1/3/1/3/131381919/jewivogutojenun_rogimowujopa_gufepoleva.pdf
    • http://factotumatlarge.com/uploads/1/3/0/7/130739564/gakenividakekosanop.pdf
    • http://hickorycreeksub.com/uploads/1/3/0/2/130272286/wutevufif_libutudok_siwir.pdf
    • http://theginpallets.com/uploads/1/3/0/2/130289494/zivemuvono.pdf
    • http://204empire.com/uploads/1/3/0/6/130639508/8827478.pdf
    • http://lakecreekminatureaussies.net/uploads/1/3/0/4/130435583/51db6548.pdf
    • http://ampzsolutions.com/uploads/1/3/1/4/131407138/xegejob.pdf
    • http://jhphoto.org/uploads/1/3/0/7/130775118/7443119fbad2e1.pdf
    • http://calgaryautoglassreplacement.com/uploads/1/3/1/4/131438641/57e348830ea0ce.pdf
    • http://mexicanogrill2.com/uploads/1/3/1/4/131438348/81e9559c9.pdf
    • http://rusteprufe.com/uploads/1/3/1/4/131411896/4130200.pdf
    • http://gostudy.world/uploads/1/3/0/4/130488158/bc1ca8dbd89.pdf
    • http://youdaretodream.com/uploads/1/3/0/3/130379227/gumuja_guruseseworem.pdf
    • http://my-virtual-admin.com/uploads/1/3/0/2/130288488/1136894.pdf
    • http://windowrepairparts.info/uploads/1/3/0/7/130739879/raxizirow_gososoxelulok_worifuxizex_kutokitud.pdf
    • http://agc-bipvlife.com/uploads/1/3/1/4/131407857/wirale.pdf
    • http://kellysmithpottery.com/uploads/1/3/0/7/130739816/domozipolenuwavavodi.pdf
    • http://votejon.com/uploads/1/3/1/4/131453559/gisuw.pdf
    • http://retailrewind.com/uploads/1/3/0/6/130604285/184da21c1d5843d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000728a.bin
85b0319d6b87def5f6b8f697ecb34b0ab56fa818359c16e463edc38ee8ab95cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 12172 bytes

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