Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a99729846aad65…

MALICIOUS

PDF

80.4 KB Created: 2021-03-15 06:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 51e809fcf76af90a27a778d04e36b4d7 SHA-1: 95c0d628cee44689d38f2d3358f783d33027aca8 SHA-256: 28a99729846aad6523d0dad67ba56ba80349933ce61454cadbe278b39593e83f
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation. The primary malicious URL identified is https://nipisod.ru/wix?keyword=dzemael+darkhold+loot. ClamAV detection and ML classification strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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/wix?keyword=dzemael+darkhold+loot PDF link annotation
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/guromid-zisodalazetobo.pdfIn PDF document text
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/darexuwodufikete.pdfIn PDF document text
    • http://duzuxilobovix.iblogger.org/78113116622.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/xabezegamadulurunix.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/varafikurim.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/pablo_neruda_love_poems_i_crave_your_mouth.pdfIn PDF document text
    • https://dewebunofimob.weebly.com/uploads/1/3/3/9/133986907/d9d26be3.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/potikofolasavefarekeriv.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/1787715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a205e068-da95-4a96-b54a-99f622ee7171/el_llano_en_llamas_macario_cuento_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89cf2b3-9c25-4c56-9f80-63b9f316256d/forester_xt_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6244777-e611-4731-b5e0-651637e01c11/25177309726.pdfIn PDF document text
    • http://melukibojenubud.rf.gd/78584481767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbe37fa-55ab-4fbc-a084-a0fb8cd90a70/fender_blues_deluxe_reissue_for_sale_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/17856180342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e3cdfc-c0f3-4a0c-a9f5-8c689070908a/cuanto_mide_una_pulgada_en_mm.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/asoftech_auto_clicker_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ac39f6-ff64-4ea5-b81f-5924d0a4b91c/how_to_describe_the_rhythm_of_a_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afa1885-72b2-4205-bc17-2f4333045b74/jack_and_the_beanstalk_story_printable_with_pictures.pdfIn PDF document text
    • http://tobisijukufoki.epizy.com/rasusebogusifidomatojaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3e5618-ee63-49b9-90bf-6768f9b4b516/23524376957.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 4636 bytes
SHA-256: cb01807ffabc85ea859cb5c3d5fba23eb9fd6af2987d584f469bec5d18919be3
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 10632 bytes
SHA-256: adf7469f6c8c8090fb52982af530ddf9c29d5c600aa874fa13222e94bf6eff63
font_02_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34