Malicious PDF — malware analysis report

Static analysis result for SHA-256 58647f6ab9d07556…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 03:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ab9292a0949542b55bb1130051065d8 SHA-1: 348e943a93dafebb3a4064a7566815774c766bb2 SHA-256: 58647f6ab9d075569c73de710f20f5c06bcd7f206f37fdbe996bfa808f43fb02
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'Tci lesson 12 answer key', aiming to trick users into visiting malicious URLs.

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
  • 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://jacksth.ru/wix?keyword=tci+lesson+12+answer+key PDF link annotation
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/8188e7117356c.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/kuwenolinarol.pdfIn PDF document text
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/buzivisoxawilu.pdfIn PDF document text
    • http://intekzafast.online/strengthsfinder_weaknesses_listmtr2l.pdfIn PDF document text
    • http://1cats.space/how_to_replace_toner_on_samsung_xpress_c1860fwt1zen.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/4f315f7925.pdfIn PDF document text
    • http://gojovujewinunuj.mygamesonline.org/mojiganofopotiked.pdfIn PDF document text
    • http://creditinquiry.info/29028623992rklq0.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/list_of_high_calcium_foods.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/zukevosuxoz.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/4408118039.pdfIn PDF document text
    • http://svarka-aurora.online/wormax._io_videos_fernanfloo9fkix.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/1238123.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/zobil.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/6983029.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/how_to_fit_garage_door_bottom_seal.pdfIn PDF document text
    • http://mebelrostov.ru/govizatlvznc.pdfIn PDF document text
    • http://allieshouseofhope.com/347713250458llvy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naburonip.myartsonline.com/creole_recipes.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/kezazopamewidu.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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 5184 bytes
SHA-256: 2271fe3846b0168a5a0fec051d9ff26114a1c85b9ba27ea5600ac125e44e921b
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 10412 bytes
SHA-256: f715b2340e0b4b9d0bdb533b6da68ede92743ade855e80ce185ab4326a5e7b36

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