Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fb229b49f7a476…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 23:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a6058ea3d5f2d0c58bb8f47293fbedd9 SHA-1: 89083a529ba50a3cc8527afac7425a11aa45ab23 SHA-256: f8fb229b49f7a4763fcc215fe53965ce9c3f82f146d6b8a9f3780948933bc69c
186 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 disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/strik?utm_term=alex+rider+movie+review PDF link annotation
    • http://healsmall.space/16296291278qu3es.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/Ciasjgm/dumofifuze.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/liferixobi.pdfIn PDF document text
    • http://opensoda.pro/sisufunarelesasuta91x77.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/gfjcVzd/alan_walker_top_10_best_songs_download_mp3.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/8788223.pdfIn PDF document text
    • http://nat-fru.space/joanna_thomas_pornzusi3.pdfIn PDF document text
    • http://ru-order-687646765445.art/what_does_a_flashing_green_light_mean_on_airpods_propd50z.pdfIn PDF document text
    • https://lurakowufo.weebly.com/uploads/1/3/4/4/134457973/namijo_gunafogeleg_zubosoloxaba_fawidexuluju.pdfIn PDF document text
    • https://tafanavudijis.weebly.com/uploads/1/3/5/2/135299899/2656987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_c1970a1e230d42d99b4ed1bad1f6e457.pdf?index=trueIn PDF document text
    • http://koxowasone.epizy.com/rekugavafireroxevili.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_59cbaf31c1bb4b7d836a9832766322d2.pdf?index=trueIn PDF document text
    • http://kolosavozogu.rf.gd/biopsychology_pinel_6th_edition.pdfIn PDF document text
    • http://notaruk.rf.gd/sentence_and_fragment_worksheet.pdfIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_b3839dc584e6439da076bd92ee61071e.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_080750779f324730978982740ae4c621.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_62cf103083464bbabe46f3bad2699bfe.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_d329364c54cb443e990ec6093bda2fdf.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_bc1bf7eb88104451867f6b159a4da645.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_872577ac8bf84a8388bde80be3a59897.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_f0fd59d0bed341f2abbc0596fe591811.pdf?index=trueIn PDF document text
    • http://kimafixenij.epizy.com/xetaxusexif.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_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 4792 bytes
SHA-256: 420609f9a00df65075fde24e18699dbbd56151a331eb5487145d1a0e6ba5e2f2
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 10756 bytes
SHA-256: 716856cdc38796d9b309dccc765277992c9a71b835f1eb6206c4e63f65ddc362