Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6e076829091d5c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-31 17:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00eea7b1d0e8336ec51ab4f4623b308a SHA-1: 51935b5540e42259a8cf446a4f3b1d66c62e8ee9 SHA-256: 5a6e076829091d5c519e18195b0810ab77ccf3d34dea2a4aa5301e1b4e866ee8
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. One suspicious URL, http://lnstagram-support.live/avg_antivirus_gratis_2019_apkccx6h.pdf, is presented with an invisible link, further indicating malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the high ML score strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://golowaki.ru/wix?keyword=tire+hammer+exercise PDF link annotation
    • http://lnstagram-support.live/avg_antivirus_gratis_2019_apkccx6h.pdfIn PDF document text
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/449636c82.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/warifejuloweku.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/d8iafsJ/32052097504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_6046c57c18e7e.pdfIn PDF document text
    • http://gooddevice-online.com/realtek_hd_audio_manager_windows_7_32_bit_free_download47n1f.pdfIn PDF document text
    • http://aycotoro7.xyz/challenge_yourself_3._3_excel_answerszykf8.pdfIn PDF document text
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/7d949829ec7.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/icnUuia/sound_fx_library.pdfIn PDF document text
    • https://jibijuzevigux.weebly.com/uploads/1/3/5/3/135333604/0ae2e919713e22.pdfIn PDF document text
    • http://henrysavbr.site/download_fnia_4ca3jh.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://tupobufilu.weebly.com/uploads/1/3/5/3/135310482/litibavumisitukiker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_600a56f81ab29.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/cjghau2/sataza.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/lixasifasi/80693709441.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/how_to_be_a_gentleman_book_download_text.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7e97a2c46ed94204832b8832c6bdb5cd.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_a2fd8789c000476baa4f38dcce3bd8f7.pdf?index=trueIn 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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 5024 bytes
SHA-256: 8125df3765fb1d8aa79f14e3e7958175695465046ccaf678c8d24d73869ae90e
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 11404 bytes
SHA-256: 067653e80a83133ff268f5f8a15814421377a00d183db7e09e3ce58b6e9d9a5b