Malicious PDF — malware analysis report

Static analysis result for SHA-256 534f60a3e7531fc4…

MALICIOUS

PDF

76.3 KB Created: 2021-06-14 21:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43ff19f6184b872359d98722358ce54f SHA-1: d1a7578d3aa69b1e8f116ef1bca613fe07833657 SHA-256: 534f60a3e7531fc4949e0096de66af2be595bda21a85934b7bc147787b6dfa31
206 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The presence of a 'movie download link' lure in the document body, combined with the high ML classifier score and ClamAV detection, indicates malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/pbw?utm_term=lucy+movie+download+link
    • https://gatuxarujesij.weebly.com/uploads/1/3/5/2/135296766/mipowusem_xikit_xixamimajupebij.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/7357334.pdf
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/vuzuvumisaruput_tedufo_pigigenefi.pdf
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/75da284a13cf270.pdf
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/4141801.pdf
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/noxavo.pdf
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/daverorexetefomezo.pdf
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/tovivutexekegup.pdf
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/ca2d2003800fbf.pdf
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/1414146.pdf
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/913742.pdf
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/vobopodabig_buraxigus_jixisoravaja_moxujodemizolup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a8a4bb1d-34aa-4f33-9adb-3926e781d9a0/what_date_does_school_start_in_qld_2021.pdf
    • http://gatasulupu.pbworks.com/w/file/fetch/144714885/24198907537.pdf
    • https://uploads.strikinglycdn.com/files/74c6639a-5ad4-40d4-8240-ddde18f21eeb/proform_505_cst_treadmill_best_buy.pdf
    • https://uploads.strikinglycdn.com/files/9c5bee10-d280-4d1d-9d8a-e3fbfb4c1293/tefirunivibafuneli.pdf
    • http://nadisizaze.pbworks.com/f/is_the_krispy_kreme_hot_light_on.pdf
    • http://tesesazef.pbworks.com/w/file/fetch/145267185/flv_download_free.pdf
    • http://fuvulokaxeka.pbworks.com/w/file/fetch/145104651/fake_bank_account_balance_prank_phone_number.pdf
    • http://watusuxipidu.pbworks.com/w/file/fetch/145128246/21971645446.pdf
    • http://jolowajuwijo.pbworks.com/f/annamayya_telugu_movie_mp4_free_download.pdf
    • https://uploads.strikinglycdn.com/files/992e8955-bc79-4f6d-aeab-90510de53f0e/how_to_report_multiple_regression_analysis_results_from_spss.pdf
    • http://woziralipu.pbworks.com/f/pdf_to_cdr_format_online_free.pdf
    • https://uploads.strikinglycdn.com/files/faecc7c5-6ff2-4d91-815e-e61f7a747395/how_long_does_it_take_to_get_your_certified_medical_assistant.pdf
    • http://gazumadu.pbworks.com/w/file/fetch/145066680/grammar_articles_fill_in_the_blanks.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee74.bin
9edeefaccec0a6c9807474939f0c42db2a1b8036e576a43e5fba6e0ff8cd3d8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 5068 bytes
font_01_sfnt_off0000ffc6.bin
25e278cc9507ed25b8b2574143a9269f475fa95f5c569e1292a5085525b3d887
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10588 bytes