Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17e4e5565ce77ad…

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 13:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65a4c0d82fa3c2204b6fbe3b73449a5a SHA-1: da8dac6708740513c138f27c748c7c08bb27131e SHA-256: a17e4e5565ce77ad604ea9c7db73ff698348ad2d38a1e2415ae5a93c48ade334
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=glencoe.mheducation.com+answer+key PDF link annotation
    • http://blekrossi.ru/60078504704ddzbc.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/bankersadda_gk_capsule_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/fv8DRsS/78683537875.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/h6qFgfu/porugefasiviruneniz.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/81ba205f3.pdfIn PDF document text
    • http://bluebadge-support.com/android_biometric_prompt_support8e4rk.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/mararaxoxiture_gubefiw.pdfIn PDF document text
    • http://50offstore.info/how_do_you_make_a_concrete_design_mix5ixfh.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/0b9289ea3a76.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/sotemudize_fozusun.pdfIn PDF document text
    • http://kungfumalibu.com/crossfire_car_for_sale_in_nigeriadshq0.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/070c246.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/18140154546.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/zadudonojijavuduxazu.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/gre_physics_practice_questions.pdfIn PDF document text
    • http://vofufime.mypressonline.com/35148242153.pdfIn PDF document text
    • https://funegalarupot.weebly.com/uploads/1/3/4/3/134316730/mibidoxuted.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/ij3jghu/how_to_bake_sweet_potato_fries_for_baby.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/93511039416.pdfIn PDF document text
    • https://cdn.sqhk.co/mejomusajob/ggPO0Cj/alien_tamil_dubbed_movie_2017.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/3519695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romofimor.onlinewebshop.net/batcher_banyan_switch.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 5500 bytes
SHA-256: 1245e43b4af2b6d09507a22f3502a3b80adcbaa75a85b80e60427776f1939292
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 11660 bytes
SHA-256: f43939c9aac9962906566074dbd37749327d4e139f821290a648b6a6215adb18

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