Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08999bb2eadeb33…

MALICIOUS

PDF

75.8 KB Created: 2021-03-31 09:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 15651ac38a3f56013d8e3b288da8d8ac SHA-1: 60796e5f2190e3c87b856decb1d2305e39e2e499 SHA-256: c08999bb2eadeb330e44c462040df507981132c5c182533f38d4864226a6e560
182 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple external URIs and exhibits characteristics of a link farm, with a high number of distinct hosts. The presence of an MFA lure suggests a phishing attempt aimed at stealing credentials or session tokens. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golowaki.ru/wix?keyword=boom+beach+hack+tool+apk PDF link annotation
    • http://lami-lashes.site/31517623299wlxzj.pdfIn PDF document text
    • http://freud.icu/fidusol44tjq.pdfIn PDF document text
    • http://dulexip.22web.org/free_printable_handwriting_sheets_for_preschool.pdfIn PDF document text
    • http://telemprom.xyz/marketing_management_textbook4f3lo.pdfIn PDF document text
    • http://bnatural.space/driver_booster_keys8abhs.pdfIn PDF document text
    • http://powerpoint4you.ru/91119439724w87rb.pdfIn PDF document text
    • http://swiss-gear.store/ubuntu_bootable_dvd_isojns0i.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/halo_effect_marketing.pdfIn PDF document text
    • http://specrazreshenie.com/passassured_top_300_drugs_quizletmdzf1.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/debufoda.pdfIn PDF document text
    • http://alcexpress1.xyz/dalitafaxumege4fhs0.pdfIn PDF document text
    • http://neuroncraft.online/81036393456e9jjn.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/spanish_color_by_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuvuvemalazot.epizy.com/behringer_xenyx_1204usb_review.pdfIn PDF document text
    • http://vamudijikepefos.rf.gd/junagobize.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/dusozimejudebofobo.pdfIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/alpinia_officinarum.pdfIn PDF document text
    • http://sulumasofip.epizy.com/39749803477.pdfIn PDF document text
    • http://sisedatumunamo.epizy.com/how_to_refill_hp_ink_cartridge_655.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/abdullah_ibrahim_the_wedding.pdfIn PDF document text
    • http://judejelalub.rf.gd/greensleeves_guitar_sheet_music.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_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 5152 bytes
SHA-256: 3aa7c92950fc378f3138286599405dc662b35ed51c6b5f7b00ee6d71b445b522
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 11788 bytes
SHA-256: 456fa32b9bb177409db3893f95df2e550a68ec0c7aefbbe26cee9421a319fddd