Malicious PDF — malware analysis report

Static analysis result for SHA-256 730fa5958e0b0ca0…

MALICIOUS

PDF

77.2 KB Created: 2021-02-25 21:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cade3c261f4f1dfcfa0307975e059857 SHA-1: 894aa7d594282857cfbfbd6b098d31ef9361979e SHA-256: 730fa5958e0b0ca03bb250cf8379a4f974c66ee8b9ed59bbd115cd04de732ced
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=oster+14+cup+food+processor+manual PDF link annotation
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/9716031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_601b002a7468c.pdfIn PDF document text
    • http://vonurejawata.iblogger.org/fimefab.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/hgdhfhj/27510706088.pdfIn PDF document text
    • http://leledup.mypressonline.com/debiz.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/jglOtjf/pareris.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/pumofawesil.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/does_complaint_to_the_bbb_do_anything.pdfIn PDF document text
    • https://cdn.sqhk.co/tefivezik/MlRSgim/botuminuroxelowodavodala.pdfIn PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/41f3917b43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fde3b5c31b03.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubokave/cZgeBif/75822297444.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/gcSjhji/nodaware.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_6019ae96953e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojuzafi.rf.gd/archdruid_lunarwing_form.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/black_et_decker_workmate_2000.pdfIn PDF document text
    • http://fivajopafovile.rf.gd/anari_song_video.pdfIn PDF document text
    • http://fewetero.epizy.com/nosegewadon.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/what_does_code_f01_mean_on_whirlpool_washer.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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 5468 bytes
SHA-256: 1c042f2f57b2a6270c45bdf730f6b16cac974ffc3e429406c58e10476db11513
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10904 bytes
SHA-256: 17bd3fb641cb150803312d549640c53df36b1039963eac22e68ec0a4d903369b

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