Malicious PDF — malware analysis report

Static analysis result for SHA-256 19afe2871db09a1e…

MALICIOUS

PDF

74.7 KB Created: 2021-02-28 21:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e87e378c26763caa782101ca52df7a48 SHA-1: b354d0ee99b1917618bda92f3a9d1a6aecd4839a SHA-256: 19afe2871db09a1e30ff4faf3c9e73ccc15f70ceb7550fcdb25c36fb47e3ffaa
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=is+ff14+coming+to+xbox+one PDF link annotation
    • http://rupebakonodeja.iblogger.org/vubezorigopebuzizef.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/fraction_word_problems_8th_grade_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ff2b0926e3a0.pdfIn PDF document text
    • https://jewigilimeb.weebly.com/uploads/1/3/1/4/131408849/3532402.pdfIn PDF document text
    • https://donoreto.weebly.com/uploads/1/3/0/9/130969624/90b3bc5d02123.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/nhjhdPS/pinball_action_video_game.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/Hgd4hdG/9765454009.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/Yjdjbjh/47430972651.pdfIn PDF document text
    • http://takodevizol.iblogger.org/vidmate_for_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fca290500c4e.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/rowivape.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/gjagfgh/survival_world_craft_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_60112c5a7dddf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumerezuwo.epizy.com/29188134686.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/oxford_chemistry_dictionary_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/writing_a_news_report_template.pdfIn PDF document text
    • http://volozixoxogibe.rf.gd/kofoforavopizikij.pdfIn PDF document text
    • http://wetowotupime.rf.gd/affairscloud_current_affairs_may_2018.pdfIn PDF document text
    • http://bozizivaposenu.epizy.com/60829096813.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/rikal.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/personal_biography_template.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_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 5148 bytes
SHA-256: b0c88b2f578b18ae40381fc92002b16d1015952cf169a48413a6dc6c14ee1564
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10416 bytes
SHA-256: 4546523eae1224683bcb9702b77a196e236f2faf9096f7ce32ca2c5f5013e6c4

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