Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4f3115fe1d5959…

MALICIOUS

PDF

82.3 KB Created: 2021-04-28 22:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f4e7c8ec903eeff60b172ab96df4e0ca SHA-1: b29f186d9d761595939b9679e473ae539c95e282 SHA-256: 0f4f3115fe1d5959597f625f926453d1fcbc801535e41c5cb66fb7dea6584b7d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=the+little+book+of+questions+mahesh+bhatt+pdf PDF link annotation
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/cd50a88.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/8745995.pdfIn PDF document text
    • http://workmonster.net/xatugolufijijosunikoaezdb.pdfIn PDF document text
    • https://kikurebimeko.weebly.com/uploads/1/3/0/8/130814200/mixudajiwa_zawoxim_baxizu_muzulolutunewa.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/sidezotudogevatakiwufu.pdfIn PDF document text
    • http://zobowodinoto.iblogger.org/diferencia_entre_temperamento_y_caracter.pdfIn PDF document text
    • http://fastnoutservice.ru/how_to_reset_baofeng_uv-822dlhg.pdfIn PDF document text
    • https://vavuvulo.weebly.com/uploads/1/3/2/8/132814906/2e2608e533df2.pdfIn PDF document text
    • http://mbfsopg.com/59623732182g0tq5.pdfIn PDF document text
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/wovodusa-ranuzumimara-fopira.pdfIn PDF document text
    • https://leviwajij.weebly.com/uploads/1/3/1/6/131637177/jebome-goxapivalepo-zivofek-pelane.pdfIn PDF document text
    • https://loxoratas.weebly.com/uploads/1/3/4/5/134507201/jikuxupoz_lotula.pdfIn PDF document text
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/65d3146b4.pdfIn PDF document text
    • https://ledobosu.weebly.com/uploads/1/3/1/3/131383424/3686986.pdfIn PDF document text
    • http://lumacy.site/78929751516lelp7.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://nunorapijepotiz.weebly.com/uploads/1/3/4/7/134736342/lorinubelolox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://matoros.epizy.com/diagnostico_de_salud_concepto.pdfIn PDF document text
    • http://dabesajunelazul.rf.gd/37064064084.pdfIn PDF document text
    • http://pirajog.epizy.com/magnesium_and_hydrochloric_acid_lab_answers.pdfIn PDF document text
    • http://wefebasutij.epizy.com/acurite_02016_color_weather_station_with_forecast_temperature_humidity.pdfIn PDF document text
    • http://duginefasozuna.rf.gd/rozamajalozesipu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 5348 bytes
SHA-256: c6b3c32123fca5539f08c0c3398bbe7132d8dcb3d147343cc39a3198a25f091b
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 10536 bytes
SHA-256: d82271f078dd6dbe7e57e17ff0dcbd480d73b2578c4b7231b0eda3e5497072e3
font_02_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361