Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16c97a0386b3048…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 09:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 063a2d33743cc90da630d4cefc4dcefb SHA-1: 69aea6a393a1f20d7d0bbe4ee7bd62ccd6d2e7b7 SHA-256: f16c97a0386b304894c73d2c4e073062a7f13fde17c147eeaa3dda600b6611c3
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, forming a link farm, with the primary suspicious URL being https://ponafet.ru/wix?keyword=my+goldfish+died+today. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=my+goldfish+died+today
    • https://cdn.sqhk.co/jeforije/fzm9hsu/color_me_happy_salon_dover_de.pdf
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/mibadovado.pdf
    • https://betepojikimiji.weebly.com/uploads/1/3/0/8/130874485/8021d9d3e50ae7b.pdf
    • https://cdn.sqhk.co/puvaguxumud/gjhcibC/peziluxe.pdf
    • https://maverutorolo.weebly.com/uploads/1/3/5/3/135393183/4986153.pdf
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/kosegirugojigeg-jobukalo-dilojagu-kegokinik.pdf
    • https://cdn.sqhk.co/pumurugo/b5bTVii/adderall_withdrawal_body_aches.pdf
    • https://cdn.sqhk.co/zuvomafoda/hblEgfj/fapegunaxagi.pdf
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/duxadarimi.pdf
    • https://cdn.sqhk.co/nomazotesi/hfxhdOZ/90186641439.pdf
    • https://cdn.sqhk.co/bivuwusim/jciaIhf/sevuloj.pdf
    • https://cdn.sqhk.co/jowapezo/ijNjiif/11912776675.pdf
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/likak_fosefiluw_pemedatebukul_lomoraje.pdf
    • http://nuzopofe.iblogger.org/how_to_delete_p0420_code.pdf
    • https://cdn.sqhk.co/wibetaxor/bihO7aN/knife_wallpaper_for_android.pdf
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/kufadejojob-midakinigu.pdf
    • https://fujireroxilurig.weebly.com/uploads/1/3/4/6/134649353/9112893.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mifofiz.epizy.com/78534932218.pdf
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_3226775184d047aca758d91ada228db2.pdf?index=true
    • http://rafokusavuti.epizy.com/treasurer_s_report_template.pdf
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_1fba774e1f8f477a9de0b9c418f90cb6.pdf?index=true
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_6cd206730b4843e8bb08a098be47a8e1.pdf?index=true
    • 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_off0000edc7.bin
c64dfe9b8b1e4dad295be8a89ae72b44d5849caac30bddccbdd510a31ff5ddf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 5180 bytes
font_01_sfnt_off0000ff85.bin
d44901e97ce25aef3eaec8e8a00216047ad8dccbfbc810a0c7cc4fcbfa9c669f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 10508 bytes

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