Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a73947a9d145e4a…

MALICIOUS

PDF

77.4 KB Created: 2021-03-27 16:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 00bdf87d7b803b61ecb63044831edc6c SHA-1: 143e24bdf4222a4f06df57931f4952b9b335ba73 SHA-256: 8a73947a9d145e4aa44c46b694d48185863471783a8006dfc9f3c144747b82ba
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://ponafet.ru/award?keyword=structured+interview+definition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485714/normal_60541f012ef8e.pdfIn PDF document text
    • http://vijofogozorumi.22web.org/maximum_ride_age_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/D2heIu1/vikosodigivikajuverakej.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/atidgil/lurekozakemefer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_601600e4621fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5fca8007dcea9.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/25586895072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5fe9ca7c3f9f9.pdfIn PDF document text
    • https://cdn.sqhk.co/muluxodipoto/cgggc8s/rowalarodelenalipuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fe111c2b97e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_605f27805faca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_604658012a591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5ff43f7bd6e69.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/nuxulikiwab/84350002605.pdfIn PDF document text
    • http://rugefar.myartsonline.com/watepevufaz.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/inspirational_quotes_chuck_palahniuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/auto_rotate_root_apk.pdfIn PDF document text
    • http://genaligonunik.epizy.com/kamibajefadufuw.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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 4984 bytes
SHA-256: 6af2e8261b2d77a1385480bb745e60f65df68dcdebdd4a267597c223b12721cb
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 10748 bytes
SHA-256: 7850226ed29976cb63b35fd68e298e4881c8ed7e0a1931c1cfcc50a476e21c89

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