Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a4233fac74adb9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 19:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21835b394bfd29f64ef3ed231bedbc55 SHA-1: 57756e315798a5d7e870e391f15b8012a0b252b7 SHA-256: e6a4233fac74adb93c7b0f1a39b9afcd00eaa5e8eee05d0a58197e6575d0b81e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to exploit users by directing them to potentially harmful content.

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://botokaw.ru/123?utm_term=loneliness+test+pdf
    • https://cdn.sqhk.co/kutajanode/tXgetih/nusesesebovoroguko.pdf
    • https://cdn.sqhk.co/xupodafib/cihSEgi/ravens_covid_update.pdf
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/xekejavogap.pdf
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/zosazudew.pdf
    • http://dapunajav.22web.org/tracfone_prepaid_lg_classic_flip_phone_l125dl_8gb.pdf
    • http://gujafitixa.iblogger.org/android_development_tools_adt_eclipse_plugin.pdf
    • https://cdn.sqhk.co/perigupa/vhgrpqU/live_gold_and_silver_price_in_chennai.pdf
    • http://jiwabozaxexe.mypressonline.com/44939117142.pdf
    • http://zuzorovix.scienceontheweb.net/jixanonoj.pdf
    • https://cdn.sqhk.co/rifusofuwedi/NijnZmH/17218908301.pdf
    • http://xamawigokoke.mygamesonline.org/92799218480.pdf
    • http://dajexori.mypressonline.com/nortel_networks_phone_for_sale.pdf
    • https://fajalosi.weebly.com/uploads/1/3/4/9/134901252/xalurudu.pdf
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/binan.pdf
    • https://cdn.sqhk.co/wavagowew/bJqkiaS/skins_for_minecraft_download_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_4ab3de7b2b904c09b4ed45879ccba44e.pdf?index=true
    • http://xogimutidum.epizy.com/fupadaxatogixeledu.pdf
    • http://kujevatumaxon.rf.gd/63437166570.pdf
    • http://vawirir.atwebpages.com/how_to_rig_a_line_for_crappie.pdf
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_cd8970e0f13e477d8eee23f976929885.pdf?index=true
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_2f46dbcabbb149949b2af01571addb20.pdf?index=true
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_01be888f842549f7a148475101692505.pdf?index=true
    • http://rurebirafana.epizy.com/89161421781.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_off0000f147.bin
9bfb0fdda7046e6831afd7e83d409fd9a694da0fdd2ce03c09cb9e25e263af6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 4668 bytes
font_01_sfnt_off00010147.bin
ea4d09a77c629bd4e16bbde0a5a14b66d2cae001f0b13a378459a155648e75cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 10688 bytes

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