Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13ac013bf946cf0…

MALICIOUS

PDF

69.5 KB Created: 2021-02-19 02:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5900a837b3fed9f205c82438d3b62144 SHA-1: b1ab1a581f85d57b2b124b19d1b3863778378ce7 SHA-256: c13ac013bf946cf019df92c02e83307552b537e8a896d380be3bb1ba9f2fed3d
184 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to a historical treaty, likely serving as a lure to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+was+the+pinckney+treaty In PDF document text
    • https://soxexovefulobi.weebly.com/uploads/1/3/1/4/131484328/lelesew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601f741bd9a08.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/tabozixe.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/Dy2jgjb/free_music_download_app_for_android_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/murevexi/dr70jjW/sniper_shooter_killer_mod_apk.pdfIn PDF document text
    • https://demomejisalazi.weebly.com/uploads/1/3/4/8/134869482/cda08d27eacec.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/rWXgdhj/color_chart_for_painting_house.pdfIn PDF document text
    • http://kavalibosesevu.22web.org/second_agrarian_reform_law_cuba.pdfIn PDF document text
    • http://vegekezivujid.22web.org/music_notation_worksheets_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/fhjieig/tower_defense_crush_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_601e27ce0a322.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/4djCz8y/zeboleruf.pdfIn PDF document text
    • http://jojujikipafoz.iblogger.org/49084465302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5fc760b78583f.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/ravuxudibure/how_to_search_a_person_by_their_picture.pdfIn PDF document text
    • http://pogapebod.rf.gd/powafugufodekifararo.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/wawos.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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 5260 bytes
SHA-256: 8ebd6fc42cc099194bc828a4d716a88ca3588c5327bc4a65bbd9a69709519d18
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10252 bytes
SHA-256: 187f29d57141d390378bd33b0bcdfc7c045b5682db1e0ba2d264dd4cb39f1802

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