Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e51869f78d4795c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-14 06:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bbd8e1d1bf08a285235e9361876a577c SHA-1: c4bb8bcd66a82ef942e7a898ad8bb923bc2cc8a4 SHA-256: 1e51869f78d4795c0e9ab251d83c10c12032c52b68855b4d123cc342b02f534d
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. ML and ClamAV heuristics strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to the embedded URI, suggesting a lure to a site offering a PDF download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/award?keyword=diaphragmatic+breathing+exercise+pdf PDF link annotation
    • https://favurujovonelod.weebly.com/uploads/1/3/4/4/134435517/9d5e71fd3.pdfIn PDF document text
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/mefajubopatid_pijivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_603b6d17684e1.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/nupiwatekilisose.pdfIn PDF document text
    • https://vobolatit.weebly.com/uploads/1/3/4/3/134349562/jamade-gusimuxoma-tuwewuxagipa.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/44023350528.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/wufizuweveto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5ffd7ad9f28c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5fe144b5a8e93.pdfIn PDF document text
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/zujapuzaxir.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/abstract_reasoning_test_for_high_school.pdfIn PDF document text
    • https://fobafomenizu.weebly.com/uploads/1/3/4/7/134753661/gemuzenolebapelobuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/72116117099.pdfIn PDF document text
    • http://bitines.myartsonline.com/jelisuletad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58261e3-eaa6-4ba8-ba7a-6c7a597c3514/walmart_grocery_app_wont_load_favorites.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/tratamiento_para_acidosis_respiratoria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17be0b25-7aa5-4412-baaa-9be8b22afcf9/scrum_the_art_of_doing_twice_the_work_in_half_the_time_-_jeff_sutherland.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/livepijerekezaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ad1d75-d544-4cae-8269-a5629638fee6/72845680712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0a3902-5b1f-458b-81c4-841d5164fbe6/individual_soccer_drills_to_do_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/17971231370.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/in_defense_of_food_michael_pollan_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97636086-1938-4033-9026-26fddf906918/kuwafisititixonebidixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2290e00-bcb2-46db-a9ad-02aa67b39303/munizexirimud.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_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 5744 bytes
SHA-256: 9130d550ed4beee3b14c0ecfcdf9e361f10aad5304e3bd6f061ccdac1aef7b62
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 10636 bytes
SHA-256: cd515136b49ae036d42caff334a86e67157521afdbc6fee89c4fdb5870469a5f