Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a62a5fbb4b1b11…

MALICIOUS

PDF

99.9 KB Created: 2021-03-25 12:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5a404a53aa065e53251ff0b4d037321e SHA-1: fc65d86ee058218c4f085ad35abffe747a6ec42a SHA-256: 42a62a5fbb4b1b11cbda6f4f0b75e400870f85712fb5b636d3a733c9ff3c843a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of external URIs and the overall structure point towards a phishing lure disguised as a product manual.

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://jacksth.ru/wix?keyword=zagg+folio+keyboard+manual PDF link annotation
    • http://topcabinets.xyz/4584658874758r2q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fd9d23622964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_6055bb236fb07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475580/normal_5ff0e8396ae8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5fd35828d5e51.pdfIn PDF document text
    • http://depotupunejiwo.iblogger.org/he_bholya_shankara_marathi_song_free.pdfIn PDF document text
    • http://spencermcman.us/salt_bae_meme_templatemsppe.pdfIn PDF document text
    • http://opt05.ru/motogumanidofit6ojdg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_601ebfb1518d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_0acd1cab30fb48ddb7168b16a7406d2d.pdf?index=trueIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_7c112832ec4b46cfa0d2280a56e091ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c08f06f-100c-4f7b-bbc5-1f48e6ae76ab/how_to_estimate_limits_from_graphs.pdfIn PDF document text
    • http://sezeludijufoma.epizy.com/99293934075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f32490a-ddc7-4025-80a5-1bd943aa8f40/storyboard_software_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/27447476241.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_fba41f75fff74b94b82f7723843f5d90.pdf?index=trueIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_aa01a2bb5ae740a6937cdeada4df0443.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/anguish_movie_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ea6996-4c0d-423e-9912-62c378d6edea/baby_bjorn_toilet_trainer_review.pdfIn PDF document text
    • http://dogurof.epizy.com/franz_liszt_un_sospiro_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 32240 bytes
SHA-256: c320a473b436e50ee7a2ebd407890fe446df1b260e06ca5bed0ca8abfa5d8fa8
font_01_sfnt_off00014a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A06 5312 bytes
SHA-256: 937734756ea82622d6de6e94b353c6f322cedc71943885832a994cc0c217666b
font_02_sfnt_off00015c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C14 10176 bytes
SHA-256: eaa0032cc59f3562e51f9bffad9a8de960a35f8ce79da5f0fa759a2678fb6fe0

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