Malicious PDF — malware analysis report

Static analysis result for SHA-256 01571b7c3996b71f…

MALICIOUS

PDF

75.1 KB Created: 2021-03-20 08:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5a1d1e11c44d7d4e772219280f275dde SHA-1: da2e4b958b1216b18f7eaad8ded162006a143dff SHA-256: 01571b7c3996b71f5516677b460ee8ada1681a498cc967244e0bcb80b6560f3e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO poisoning tactic. The primary lure URL, 'https://soxebez.ru/wix?keyword=walz+group+cpa', is associated with phishing. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/wix?keyword=walz+group+cpa PDF link annotation
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/sitefo.pdfIn PDF document text
    • http://jutidewolojura.mypressonline.com/tesujiwu.pdfIn PDF document text
    • https://pamesatigifimes.weebly.com/uploads/1/3/4/6/134639420/d4205.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/bobs_burgers_synchronized_swimming_transcript.pdfIn PDF document text
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/e440ea397739e.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/8878016.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/novunijafufesexuj.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/nadavo.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/22775188338.pdfIn PDF document text
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/feketaxotupifibajum.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/jowup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/nukosojaviwoduvamadenixu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/crucigramas_el_pais_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/nutafusezizavirolomaju.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/a_b_c_d_rhymes_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/pateradujoleritexurix.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/bullizmi_ne_shqiperi.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/bsr_test_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/how_to_connect_midi_controller_ableton.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/63068222057.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/42495680951.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/how_did_world_war_1_change_the_map_of_europe.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/jodopuk.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/35339746313.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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 4984 bytes
SHA-256: b887c4953bbe4a2ea84b15670c0fe2f202a4ef08c55afad6ea093d5271842155
font_01_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 11448 bytes
SHA-256: 1759019c4f52b5d9a74a51f70ddedabbed9adedab5e9073258ff56bcd620e168