Malicious PDF — malware analysis report

Static analysis result for SHA-256 0297a2a452fcf637…

MALICIOUS

PDF

76.6 KB Created: 2021-02-16 09:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b5bb2a1d6ee4ddf37a38fb4089b4d971 SHA-1: 76054fb0e8c2480e994474ed44f27dcb847423ce SHA-256: 0297a2a452fcf637b4e80c56a2aaefb74b39ccebff511c1ec16496a94cbd222e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=kenmore+elite+oasis+washer+fault+codes PDF link annotation
    • https://cdn.sqhk.co/pabefidinaz/jdjajah/47879455821.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/DPbtgeF/phone_recorder_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/hidpDLc/marxist_socialism_vs_utopian_socialism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_600b3832ac7bc.pdfIn PDF document text
    • http://uscarins.info/baal_veer_episode_1200_videoex31h.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/hhwzjbk/65762951096.pdfIn PDF document text
    • http://4gusevshop.website/pixel_gunner_apkjr012.pdfIn PDF document text
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/monuranozupatogikiso.pdfIn PDF document text
    • http://top-odejda.com/aimpoint_golf_putting_chartsh35gw.pdfIn PDF document text
    • http://poradoit1.site/custom_skin_creator_for_minecraft_unlocked_apkdqviw.pdfIn PDF document text
    • https://cdn.sqhk.co/kegimovotol/pYzAyia/11street_malaysia_seller.pdfIn PDF document text
    • http://remontnatali.ru/save_the_earth_t_shirt_liza_koshy37ebu.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/d8949221.pdfIn PDF document text
    • http://salet.store/departing_australia_superannuation_payment_application_form8gzvb.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/vabedafozo/casperjs_big_file.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/zefil.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/fisemitun.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_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 5324 bytes
SHA-256: 002cc66df0f34bfd7c134f9367fbb7a1212d549cde00e9325bed889adedb5f63
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10428 bytes
SHA-256: 640cb0bdfd5450c9ef69af1bba25968c8ae1b5a296020097614036a49f5deead

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