Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdf101d66e21c99…

MALICIOUS

PDF

116.7 KB Created: 2021-04-11 16:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e7957652abbea8a8ad75fa8192b7d57f SHA-1: d3ec8fdaad8d93413e42c0aef1d476278089b4d2 SHA-256: dfdf101d66e21c99213f77424170aad080758843a54ae5cf575b64f299f0245b
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of a 'download' button lure further supports a malicious intent to trick the user into clicking potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://jottigo.ru/strik?utm_term=davinci+resolve+15+tutorial+color+grading+crash+course PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465543/normal_603345a80c0e2.pdfIn PDF document text
    • http://sebekeruxa.iblogger.org/ca_inter_books_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420910/normal_5ff02fa38e954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_603df9bb0763a.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/tukuxikubasugakij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_602b2802440d7.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/caterpillar_gas_generators_catalogue.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/logiciel_traducteur_anglais_francais_gratuit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60183efa3d619.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/gupalakoga-kokuliz.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/handbook_of_public_relations_11th_edition_free_download.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/bayesian_networks_with_examples_in_r_download.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/prefixes_and_suffixes_rules_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fdbf78e5253a.pdfIn PDF document text
    • http://bovakepixoworax.iblogger.org/battery_life_repair_pro_apk_latest.pdfIn PDF document text
    • http://revukajazoweku.22web.org/laporan_pendahuluan_penyakit_jantung_koroner.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/rocket_propulsion_elements_9th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufikemofumop.atwebpages.com/tribes_victory_worship_chords.pdfIn PDF document text
    • http://vigejufad.rf.gd/romeo_and_juliet_summary_act_1_scene_1_-_nerdstudy.pdfIn PDF document text
    • http://silabigajevova.epizy.com/84534890678.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E79 5436 bytes
SHA-256: 32b5362352c2fb867cd4b2a9e80cafd53243be03b1ef69305633e62816e68d24
font_01_sfnt_off000180ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180FF 14700 bytes
SHA-256: b788bfbdabaf99bfd6b0b728501395fc9a126a1be5a0b6c0d11db0d04cd9ff31
font_02_sfnt_off0001afb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFB9 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15