Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a387e5f6389b3c…

MALICIOUS

PDF

66.3 KB Created: 2021-03-28 07:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 462ed1049ad82def010cf638086d8287 SHA-1: d55b75dd26214f03accbb7675bc5150cc0b21dc3 SHA-256: 65a387e5f6389b3cdc0c1b7f5c93ba2162ef266048cb9ba83196d5f3aded54d1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aligning with phishing tactics. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=deer+predation+or+starvation+worksheet+answers
    • http://circulyarkadigital.xyz/how_to_use_my_bushnell_telescopekuvpg.pdf
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5ff3d490016c4.pdf
    • http://vopugixeroramox.medianewsonline.com/sivapuranam_thiruvasagam_lyrics_in_tamil.pdf
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/e24c87f.pdf
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/tokureset.pdf
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/5583486.pdf
    • http://ilook.market/ge_universal_remote_7252_code_list2z5qk.pdf
    • https://mumujikik.weebly.com/uploads/1/3/4/8/134896301/zomisojigerubodi.pdf
    • http://helplnstagramoffice.com/nursery_rhymes_youtube_video_little_baby_bumujbhr.pdf
    • https://cdn-cms.f-static.net/uploads/4405443/normal_6052a8933f3f5.pdf
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/laxetogaruwugatuki.pdf
    • http://nomudepalak.medianewsonline.com/which_bible_is_more_accurate.pdf
    • http://sakivometo.medianewsonline.com/xesativovujiniporimifag.pdf
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/wojewipudaforuzu.pdf
    • http://copyrighthelpbusiness.net/tsunami_hollywood_movie_tamilgrwby.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_600d1636deae0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nijudow/voicemail_to_text_android_free.pdf
    • https://s3.amazonaws.com/migivewuwe/probationary_period_calculator_spreadsheet.pdf
    • https://s3.amazonaws.com/xifabilejilab/class_10_maths_chapter_1_notes.pdf
    • https://s3.amazonaws.com/voropa/57453351723.pdf
    • http://nibizuladode.onlinewebshop.net/bank_job_math_book.pdf
    • http://nabulegewuwal.myartsonline.com/illustrated_russian_grammar_by_gotta_tsvetkov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f8.bin
3f1e82fac4671eda8b0655584206401c2765fed500646c06aa895309a7462040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 5228 bytes
font_01_sfnt_off0000d8d1.bin
8cfe0c6f09e337c6c42799882339d8be72ea117596bb4bc0d6b6209c17c85053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 9676 bytes

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