Malicious PDF — malware analysis report

Static analysis result for SHA-256 156a1d002ae5afd8…

MALICIOUS

PDF

105.1 KB Created: 2021-03-25 17:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 03aeb6fb118927868c87b8bff17aa9fe SHA-1: 4c13e1711bfd2e8b05c816e8ca8ba80af83f4733 SHA-256: 156a1d002ae5afd841642e67637c33ab183e2f27dbb7caebfbe52ba49cf583c7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content-based clues, but the presence of numerous external links points towards an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cdn.sqhk.co/mekaxosur/DJnghih/domino_pizza_stock_news.pdf In PDF document text
    • https://cdn.sqhk.co/riteximeras/oif1Uji/fizapizupovi.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/buturikojifud.pdfIn PDF document text
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/tasobosofikokaru.pdfIn PDF document text
    • http://wiwikiru.iblogger.org/presentation_skills_body_language.pdfIn PDF document text
    • http://italywom.space/luz_sobre_el_yogag7mxt.pdfIn PDF document text
    • http://erogan24.website/furelizuhuu22.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/fxht2w2/boxofoka.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/G8wzihi/hmrc_vat_rates_2020.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/rorutasojubobufive.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/xuhcjdm/mickey_mouse_voice_changer_online.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/padupuwisevego.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/tokuxiwis.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/xolalovufisajakuwojo.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/zunazowel-nedefali-soduzi-dewurateson.pdfIn PDF document text
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/5936694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=what%20is%20evolutionary%20developmental%20approachPDF link annotation
    • http://dukasazufada.epizy.com/can_arousal_cause_spotting_during_pregnancy.pdfIn PDF document text
    • http://niwuzij.rf.gd/understanding_tax_return_form.pdfIn PDF document text
    • http://xapemekofutomun.rf.gd/caretaker_job_description_template.pdfIn PDF document text
    • http://fodiwivovekuvut.epizy.com/oracle_database_11g_client_download_for_windows_7_32_bit.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/hepatitis_c_easl_guidelines_2018.pdfIn PDF document text
    • http://rapuwovire.rf.gd/perfume_the_story_of_a_murderer_full_movie_download_dual_audio.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/ba_flight_cancellation_compensation_online_form.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/dawedofuzuverubekax.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_off00015ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBD 5488 bytes
SHA-256: ddd5f5aa00269f62c27c8934f2a15e3bdec7a52ac0115cbf5292a03ad998789f
font_01_sfnt_off00017150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17150 11384 bytes
SHA-256: 3d085fe777959e3d3fc5023413fb67fcc4897fd1a0c5d9ace99a456a43d2d001