Malicious PDF — malware analysis report

Static analysis result for SHA-256 78726ffd9d336fb6…

MALICIOUS

PDF

80.4 KB Created: 2021-03-18 12:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 976770dec1af3bc5e86af3919e7d7d8e SHA-1: f14789e30062cdc8caf954028c574d0721534696 SHA-256: 78726ffd9d336fb6098292344ba9165ef0c9026987a51a28de0f6863316017c0
194 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external links, many hosted on disposable domains, designed to obscure the true destination. One prominent URL, 'https://nipisod.ru/123?utm_term=annabelle+creation+full+movie++free+hd', suggests a lure for movie downloads. The presence of a 'Download Button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent to trick users into downloading harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://nipisod.ru/123?utm_term=annabelle+creation+full+movie++free+hd
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/cc6a76be98e48.pdf
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/825c4c8cd3a8.pdf
    • https://rinavogorefun.weebly.com/uploads/1/3/4/4/134446464/1842650.pdf
    • https://valofapapedor.weebly.com/uploads/1/3/1/1/131164243/pulob_tarerudoxu_furajapade.pdf
    • https://xutonipojoneri.weebly.com/uploads/1/3/4/6/134667901/fepofozigob_biliro.pdf
    • https://nokaroropufut.weebly.com/uploads/1/3/1/4/131453144/2372508.pdf
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/fagawexubilekoxabufe.pdf
    • https://rawaruginoninum.weebly.com/uploads/1/3/1/0/131070401/1651313.pdf
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/gogisegifakapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wumepudefix.rf.gd/radademikuwirejulifoja.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_2bb0fb9d3f6f42e8abce29e75f97c7c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b6d4628a-5fbe-4c48-a9c0-972fa943fc55/maytag_washing_machine_mvwx655dw_reviews.pdf
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_22757fc67a73474096f22917f3b01a3a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd6aeee9-2d67-4b58-922f-66e2c768c3d2/jopopowudepasuxixawipe.pdf
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_3e143ba8a2ba47c9b4664e95f0f2cb33.pdf?index=true
    • http://zitokobu.rf.gd/3_ejemplos_de_derechos_humanos_en_la_vida_cotidiana.pdf
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_2a6a68ec752346e9b59251ae7700dd0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/479dceb1-5640-41c4-82b8-afb963372b48/9694333073.pdf
    • https://uploads.strikinglycdn.com/files/4c2d0ffe-b25e-4d40-a830-867470a86b57/lista_de_verbos_en_ingles_regulares_pasado_simple.pdf
    • https://uploads.strikinglycdn.com/files/095a734c-7271-4c14-b4f9-141d051cbb88/35094425361.pdf
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_cc1dc5168d594997a8bfb455fa55a12c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a4.bin
ec157a6cd23e29bebd890187d0b3b00f6030bd662977d9e42a73c0fd138d2592
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5272 bytes
font_01_sfnt_off0000f869.bin
e4018f6b1921a6c7bc105748529bee334c830903fb8ac7252cc9721c3dc20479
pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 10960 bytes
font_02_sfnt_off00011e3c.bin
c7e97880079579d452846af4ffe20812fd2f52f2454527fe76aea9af5d83cac8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 16216 bytes