Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9a72554e379f12…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 07:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 35d20977b7342774f971fed651a6bb82 SHA-1: a6c0856a28dc3f372b15042983973b9668b49588 SHA-256: ca9a72554e379f1285dfc2e10e4e9bd527213ac6c01dcca69a45aa5df231ef55
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The ML classifier strongly flagged the PDF as malicious. The primary function appears to be directing users to external resources, likely for phishing or SEO spam.

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://maypoin.ru/wix?keyword=notes+of+a+native+son+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/totafeta/jdj6hfj/1401021395.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufojigox/ghbfrOO/jutizewux.pdfIn PDF document text
    • https://xasejudezorakoz.weebly.com/uploads/1/3/0/8/130813307/zovigufotebar.pdfIn PDF document text
    • https://cdn.sqhk.co/wevubuse/g2ieCie/liverpool_latest_news_today.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ijgg3Iq/15422629048.pdfIn PDF document text
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/bududokovuxeku.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/OhiLnjf/72207933967.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/xusakomekubesuzoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/N71gcvQ/minerva_ohio_post_office.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/RILyFZR/20821695272.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/JzkRhbI/dituwikipunanedijolunixa.pdfIn PDF document text
    • http://rizaxezo.iblogger.org/does_directv_work_with_apple_tv.pdfIn PDF document text
    • http://rakojegad.22web.org/91968960211.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/sarinipoj_fivax_kemobinurabeja_xerulopadoz.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/fedufiporara/bilezulimufivuxotazukawuf.pdfIn PDF document text
    • http://metotosebofetu.epizy.com/22171477896.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/all_transformers_revenge_of_the_fallen_toys.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/bibijivufatuvawuwalago.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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5116 bytes
SHA-256: 81561ea9547666cfb39c397ac5c8a3465e89ec2400aa80c1cb45ca213a64ec35
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10380 bytes
SHA-256: 1da39f0e21e5ce14a02659702abf1335ec70f3dcbc80e5e02d41969598f92cf4

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