Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d5e6f0d263c92f…

MALICIOUS

PDF

70.5 KB Created: 2021-03-03 06:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3d35588ca7a7c7761e91547a846bbc7c SHA-1: 287a9c833b7997a37fc3195911310b5ca99bf9d3 SHA-256: 80d5e6f0d263c92f9f4bc0fae3045401d8e350f3ec309a961574280e7a0210d1
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's designed for SEO spam and phishing, with a prominent link to 'ponafet.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=dragon+naturallyspeaking+fehler+166 PDF link annotation
    • http://timelessdecorum.com/43352662804y9rd1.pdfIn PDF document text
    • http://praktika-ingenieur.com/c_programming_video_tutorial_free_downloada1rdz.pdfIn PDF document text
    • http://sentytld.online/52406352844yydqx.pdfIn PDF document text
    • https://romizipomubem.weebly.com/uploads/1/3/0/7/130775952/7067071.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/telefeteroju_fidulasa_jojoma.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/7468688.pdfIn PDF document text
    • http://vilurusunus.22web.org/apache_poi_java.pdfIn PDF document text
    • http://vitrinachel.ru/wheat_belly_book_reviewxrm7c.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/damerirazib/lidir.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/skype_old_version_offline_installer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/learning_head_to_tail_vector_addition_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/14609409776.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/pojaluguravovawoxubifi.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/jilutigurutazuxekujugusok.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/youth_concentrate_sheet_mask_body_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/motorola_apx_7000_bluetooth_earpiece.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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 5536 bytes
SHA-256: 6e131d18916cbc1a747b505e292218c1317266d7d5b82277b9cef0a759e667ec
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 10276 bytes
SHA-256: 99f7e393b7378116e10bb5d66a43a5b04548309d52830ec39f5a0da77048985a

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