Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de04afe1177b80d…

MALICIOUS

PDF

78.4 KB Created: 2021-02-27 19:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f7af97b4a2de09d3936fa06a4dfecc6 SHA-1: 1b0bb19007338ce89eee59e3b5daf41208af8303 SHA-256: 4de04afe1177b80de49bfdb08458854cc3cfc7eaa75d6fb04d7c9defad39b4f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=importance+of+minor+characters+in+the+great+gatsby PDF link annotation
    • http://jenuxijaf.mygamesonline.org/how_to_lose_weight_eating_3000_calories_a_day.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/patanjali_yoga_sutras_in_hindi_by_vivekananda.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/3466567.pdfIn PDF document text
    • http://manamuketamas.22web.org/google_certified_android_tv_box_list.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/voyager_legend_cs_replacement_headset.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/62478626685.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/oppenheim_view_on_international_law.pdfIn PDF document text
    • https://vunanidisavozi.weebly.com/uploads/1/3/5/3/135324284/gazitef-kimibagaw.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/tamil_nadu_registration_guideline_value_2017.pdfIn PDF document text
    • https://gasibikame.weebly.com/uploads/1/3/2/8/132814219/93aabab13e.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/99191653989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girifatu.rf.gd/are_omron_blood_pressure_monitors_fda_approved.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/how_to_insert_mendeley_citation_in_word_2016.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/roomba_960_review_carpet.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/skyrim_best_beginner_build.pdfIn PDF document text
    • http://zumoriko.epizy.com/zafawenodafesewol.pdfIn PDF document text
    • http://lajonapeloros.rf.gd/german_imperative_form_gehen.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_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 5576 bytes
SHA-256: 1af24dc8638e63292e4d05ce7154a50de6ad463446bd377beed035369591998a
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 10240 bytes
SHA-256: 44f4569168ff9bb6d0f1ec7a6b0ad4de31425fe2eb590cddd5d234bbe1270734