Malicious PDF — malware analysis report

Static analysis result for SHA-256 915aaacf91dcaf39…

MALICIOUS

PDF

68.2 KB Created: 2021-03-28 12:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e90a608390c4d8f6e827b731dd95ef4 SHA-1: 5dd3df2c05c49a7e2ae7f00a8240ef11d89362bd SHA-256: 915aaacf91dcaf394819aef4a04f9bd1d65408d98f09c6c7daceb12ea80112c2
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, with the primary heuristic indicating a 'PDF_SEO_LINK_FARM' pointing to a Weebly domain. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a campaign to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://leonvi.ru/wix?keyword=little+creek+labs
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/natumodimup-duxufawevaja-zokusebupijeve.pdf
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/talidoji.pdf
    • https://static.s123-cdn-static.com/uploads/4492240/normal_6004b5cbd3ae7.pdf
    • http://mamuxorap.getenjoyment.net/97243959320.pdf
    • https://static.s123-cdn-static.com/uploads/4492588/normal_5ff26d3e77989.pdf
    • https://lopodegif.weebly.com/uploads/1/3/2/6/132695694/wekoxodiv-nugeletole.pdf
    • https://cdn-cms.f-static.net/uploads/4486566/normal_6052359909c70.pdf
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/1132156.pdf
    • https://cdn-cms.f-static.net/uploads/4482188/normal_6057fa7784b1b.pdf
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/tizobawofuma_sojisarufi_redegoziparax.pdf
    • http://gexopidikimo.mygamesonline.org/takujutusuviguzofop.pdf
    • http://govuxojikasumot.scienceontheweb.net/pajulapolamogazebi.pdf
    • https://cdn-cms.f-static.net/uploads/4419423/normal_60513d965907d.pdf
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/demenol_wabudu_dudagiweno_tifad.pdf
    • https://cdn-cms.f-static.net/uploads/4456996/normal_60130b1d1dc81.pdf
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/mevaxatigosibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kobivimelelo/13008284212.pdf
    • https://s3.amazonaws.com/gogoxowiniza/btc_all_information.pdf
    • http://bavotuvezomevi.myartsonline.com/sililumisiwelepigexaxog.pdf
    • https://s3.amazonaws.com/varolexexus/xixidizovumexavi.pdf
    • https://s3.amazonaws.com/xamapebonijos/navigation_bar_android_pie.pdf
    • https://s3.amazonaws.com/waduzirader/59521490230.pdf
    • http://manuwakagekewu.onlinewebshop.net/gifuzi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdae.bin
37d889977428bbf8278c8c43cd51f4953e59ca6cb22ad1d2b9d498ef34049992		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 4936 bytes
font_01_sfnt_off0000de88.bin
aa13e250b23dbcf288dfc48a81b8f28f51711b3921e04881ba47f1af3b63aad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 11040 bytes

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