Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efba34257fc2b19…

MALICIOUS

PDF

73.5 KB Created: 2021-03-08 22:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4189ec8a408f6146c2e67f40c5677ef6 SHA-1: b5e9abd13828d229bcc1515e7698d72176a864a1 SHA-256: 6efba34257fc2b192c4443af71bdbbede0fb31a66dd042a289791807a98d1723
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to weather and application metadata, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=weather+in+washington+state+in+april+and+may PDF link annotation
    • http://sovuradema.medianewsonline.com/fs_i6x_range.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/2851273.pdfIn PDF document text
    • http://avtoshtorki.shop/cloud_bread_recipe_cornstarchxmd91.pdfIn PDF document text
    • http://vorecan.fun/54391770251swyzi.pdfIn PDF document text
    • http://kavakedego.scienceontheweb.net/the_best_of_me_dawson.pdfIn PDF document text
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/c561bc7123b4d.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/schwinn_ic3_console_commands.pdfIn PDF document text
    • http://gufutaca5.xyz/pekulidetisosomezixaxy9e9.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/9429444.pdfIn PDF document text
    • http://sale-siberian-force.online/boast_meaning_englishz3egb.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/sebax.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/korean_grammar_free_download.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/89426407383.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/42615094791.pdfIn PDF document text
    • http://revukajazoweku.22web.org/b_v_ramana_engineering_mathematics_solutions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/79051d3c-118a-4466-96b0-3355fad48c87/a_and_p_john_updike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e08010-304a-4bbb-98e6-8567bed5d4d1/54142370596.pdfIn PDF document text
    • http://deweget.rf.gd/wusikapepuzaxokelotewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e944ce4a-7b6d-4560-85d1-04728e775ef8/download_driver_hp_scanjet_5590_for_windows_10.pdfIn PDF document text
    • http://dobozuva.epizy.com/63209104808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7de3d64-e0b1-4c4a-971d-d6f2f10e1904/left_behind_series_book_3.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_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 5580 bytes
SHA-256: a7ee8283742f176ab424cbdd736e9f25c759925eea10cf8b3ed9840abbba5219
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 9908 bytes
SHA-256: 373275748026ab4a96fa2d9a4d82e7c177c42b9d7ff98af0dcbf991aa4d85672

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