Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73485e95e088869…

MALICIOUS

PDF

95.0 KB Created: 2021-04-05 05:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 61bd1ff88bc273e9469b1826b03262b0 SHA-1: 80289ec7124dfb1ff7d81f6dbd218b132c335ff0 SHA-256: f73485e95e08886990cec9425e854ac500e20f04cd825e2040e9037ebd503c98
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm designed to manipulate search engine results for malicious purposes. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=anesthesia+pdf+free+download PDF link annotation
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/nukefej.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/hjb7jbU/alchemy_jug_5e_acid.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/wazopatowulag.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/numab.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/ihijgif/76378142284.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/4KhgZ7x/9230761695.pdfIn PDF document text
    • http://rowokalasi.iblogger.org/pebabiraguzulewujojetovu.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/Qdw5Fjd/77788786549.pdfIn PDF document text
    • https://nafuginanosuja.weebly.com/uploads/1/3/4/5/134598664/zupedanet.pdfIn PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/7475787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xamusewegelaru.rf.gd/64440933486.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/dawibujukewibufiw.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/27047478597.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_fa16b8ead443402680e2889266373b58.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_994c662739394fefb47aeb5e2d4a84d8.pdf?index=trueIn PDF document text
    • http://tolerikaduvutef.rf.gd/34539636886.pdfIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_77578051cd49441d9e45f96c5c82f349.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/debujamagirikatazojufakag.pdfIn PDF document text
    • http://voderekop.rf.gd/does_amazon_pay_more_than_google.pdfIn PDF document text
    • http://wogulixa.epizy.com/audio_amplifiers_databook.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/tamuboxi.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_0452c5ea64cc439a82299ccff3fc9cdf.pdf?index=trueIn PDF document text
    • http://kajemirari.rf.gd/application_programming_interface_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/pt_astra_international_annual_report_2018.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_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 5208 bytes
SHA-256: fb05eaa66e85ba07545b34c6b560f7b93f3156434e851292f1083b13ea397378
font_01_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 11452 bytes
SHA-256: ec2028327fb91cf992369c9e2c94e6021af3f346e5d9fc9348c0789db44e86a6

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