Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da606538a257f08…

MALICIOUS

PDF

91.6 KB Created: 2021-04-19 02:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0359903a0577dcac590c71d9357bba6 SHA-1: 3ac579313f7a07122e7a029bba28510afd2aa480 SHA-256: 1da606538a257f0825d999e54e0c017ea976545583e79fd6cb1b114f55cfb08a
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 of which are to PDF files, suggesting a link farm for SEO manipulation or phishing. The primary malicious URL, 'https://baarspo.ru/strik?utm_term=best+camera+for+photography+beginners+reddit', is likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=best+camera+for+photography+beginners+reddit
    • https://jupuwova.weebly.com/uploads/1/3/1/4/131409597/7ad50648d.pdf
    • https://duxegolukazokun.weebly.com/uploads/1/3/1/3/131398215/d15921a1.pdf
    • https://cdn.sqhk.co/sosexazefip/1ijajjI/24619952258.pdf
    • https://cdn.sqhk.co/xanikadir/mih9YQU/93965690321.pdf
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/dotut_jefifosipipaj_rajinuj.pdf
    • https://cdn.sqhk.co/xaselavub/ifii8ji/1874482497.pdf
    • https://cdn.sqhk.co/wifukatar/7dNidA9/farming_jobs_near_me_part_time.pdf
    • https://cdn.sqhk.co/tikalamin/icuHLOa/76739767162.pdf
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/siwekumeriberof.pdf
    • https://tetarexaxamos.weebly.com/uploads/1/3/1/4/131483090/dajalatomumet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dutuzanob/radutiwid.pdf
    • https://s3.amazonaws.com/napoledunadigo/moledaloxujikiburo.pdf
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_c5d9dd68c3264153b67db3d57728ce10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3065f56c-cdf8-416d-af19-4aac8ea2f33a/wazamajazedubumiguxixo.pdf
    • https://uploads.strikinglycdn.com/files/4f1031ba-605e-4585-a134-8aaf7b3b4142/best_gopro_backpack_strap_mount.pdf
    • https://uploads.strikinglycdn.com/files/0687f089-c86c-43cc-9d3d-071806800cec/tojuxirane.pdf
    • https://s3.amazonaws.com/jazuravazaguz/shaded_red_long_haired_dachshund_puppy.pdf
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_7a889f6964e74a1faa4f9ab02d26acfe.pdf?index=true
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_7275fe68bc1143fdb170e1e35489d9b2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/22824ae0-8b0a-434d-ab99-7472c3c050c0/muvitusag.pdf
    • https://s3.amazonaws.com/tumuzu/24366797954.pdf
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_5c4f1147652444d6bc1d35f4e2db70e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/273ce054-f473-47aa-9c30-8d3ce731bd95/how_does_bitcoin_mining_work_for_dummies.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_c3e37c1f893b44718c3a0fd3fdeb4b91.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cdee1851-2294-4f2c-bb11-e3f2678686f5/the_invisible_man_hg_wells_quotes.pdf
    • https://s3.amazonaws.com/poresi/srirangam_ranganathar_photos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127aa.bin
b2e4fa9957be39feae71df4cbe37dc58281c49f15afc1658901271285d10d6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 5828 bytes
font_01_sfnt_off00013b5e.bin
749aafd89e4a67dbd5c8152c55e3af75c837aec7dc5b418441cec027f26400ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 10992 bytes

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