Malicious PDF — malware analysis report

Static analysis result for SHA-256 7900f2685956c339…

MALICIOUS

PDF

95.2 KB Created: 2021-03-20 15:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5125bcb7d02def4a1f3f55ef577a5fe9 SHA-1: c16b3913f5565aa36179ca8fe5d60cbc1be1a723 SHA-256: 7900f2685956c339c22502ea5778f4ba9f12d31c237b7d489c51adbbd1671079
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/award?keyword=sap+jantung+koroner+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5fca969f81aaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5fc9eccd58f50.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/hLECQIi/romantic_birthday_wishes_for_wife_video.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/f0efd2dc.pdfIn PDF document text
    • http://didanak.22web.org/zigapuda.pdfIn PDF document text
    • https://kamidosebesu.weebly.com/uploads/1/3/4/5/134593467/34e2dda5fe1d84.pdfIn PDF document text
    • http://keep-travel.com/sawibeji1tfq9.pdfIn PDF document text
    • http://good-production11.site/how_to_do_letters_on_cricut_makersu7kl.pdfIn PDF document text
    • http://sungo1.space/business_flyer_templates_free_wordhus7u.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/zibibinugido_losiki_zakopowit_rebeto.pdfIn PDF document text
    • http://bestcreditcheck.info/what_are_the_basic_assumptions_of_feminist_theorytuwha.pdfIn PDF document text
    • http://se-mrush.com/free_safety_signs_download2blj7.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/jarjjjf/dagowukidunila.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/daxagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fe7255f818f6.pdfIn PDF document text
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/vebikufam-muxuwesitakiloz-lixetob-weraw.pdfIn PDF document text
    • https://jajixawu.weebly.com/uploads/1/3/5/9/135992574/diparopo_vaxama_kewubevexenava_wijavalemapuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_36152f5952754b029ac3cbcdc1c40104.pdf?index=trueIn PDF document text
    • http://tosakiviga.rf.gd/quality_assurance_free.pdfIn PDF document text
    • http://galojuxutiwas.epizy.com/19015714122.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_cab2cba692c54968849d83294a6e7bda.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_b584d2f96b3a4e7fa20eae54df4b4c8d.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_c742816a99f343e684267a5bd0f3852c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 5244 bytes
SHA-256: 5c520f9fa1f3a1ae067ad7aac94f19bb80f7dd827fe799d44d30ea70532e5b71
font_01_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 11452 bytes
SHA-256: c4585d678acc46a9d7cef40f2d7846de7c9072424c7df2dde1d5b36ffa62ba2c
font_02_sfnt_off00015a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5C 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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