Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2af778a8f1890f…

MALICIOUS

PDF

70.0 KB Created: 2021-02-14 14:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6d351235383dde3c32a6ea4fa079760c SHA-1: 669b065811fa1d5ea9579f3df73d7b9b4a9d000e SHA-256: ef2af778a8f1890f15ca8bb4bffb304cc04af4a07d40a246d05c6d870b2dc8ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. The embedded URL and the heuristic firing for PDF_SEO_LINK_FARM indicate a strong attempt to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

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 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.
  • 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/wb?keyword=annuity%20math%20questions%20and%20answers%20pdf PDF link annotation
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/9469476.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/8e3d979c.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/gDJjiha/freak_avicii_sounds_like.pdfIn PDF document text
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/8ca47e997c2aa.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/lawux.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/cihwpeh/pepitotonasulamuxusebow.pdfIn PDF document text
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/c5902.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/BgeWiil/99808205273.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/IWjfAgd/tegurewuluwu.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/jh64jhR/mubekile.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/jbIiTgi/fegixavomexiwawe.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/cCgfijn/woderomezuteporar.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/gurupixabogivaz/linkin_park_castle_of_glass_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/pabejajamapewofajupik.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/korubexeganapekeke.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/79717421552.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/onam_2019_wishes_malayalam_images.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/xutij.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/93546350909.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_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 5556 bytes
SHA-256: a6227ec3dde08df1adb465d7e0c30e765fc97e292cead5345a94be87d09b2fb4
font_01_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 10572 bytes
SHA-256: 7963a486e84df18a542a848909ae8f9a36c1c115d5ff147debd34e9f41fe3f11

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