Malicious PDF — malware analysis report

Static analysis result for SHA-256 672a3f0a0c1312b3…

MALICIOUS

PDF

81.0 KB Created: 2021-03-23 06:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 625bd83972e070f13ac0a0f5946f12c8 SHA-1: 2a96791e35e5fb2e4bf7dee8c2fa1b758de4d226 SHA-256: 672a3f0a0c1312b312e194fba362b24994efd1e9fe722d8a9837dd6edc055820
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized content farms, a common tactic for phishing or malware distribution. One prominent URL, 'https://golowaki.ru/strik?utm_term=why+is+my+ninja+blender+blinking+red', is presented as a lure related to a common household appliance issue. The presence of a large number of PDF links and the ML classification strongly indicate malicious intent, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://golowaki.ru/strik?utm_term=why+is+my+ninja+blender+blinking+red PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388619/normal_60224fc8dd015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476122/normal_5ff248362d6f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_600be44fa20c4.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/wufemitadexonuto.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/xijebugutafimiluka.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/ligoxidamiv-vupag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421613/normal_600111b7932ea.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/tedadibinekatedewuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_600c367fd9c29.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/ziloza.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/5185925.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/20688444818.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/tajimipojimo/lorezabe.pdfIn PDF document text
    • http://medexode.atwebpages.com/49399794281.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/47231042631.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/cantus_firmus_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/63151019478.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/a._n._m_ka_full_form.pdfIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/xudabebon.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/data_structures_and_algorithms_quiz_book.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/59733685851.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_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 5636 bytes
SHA-256: e15fd612903dd321ce1e767885e2edf4774ed924b5fc550de60d81ee29ba4054
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 11076 bytes
SHA-256: 123cdcaf0a684216c975b29d6727739aeb277b6803c8f6317a260207ec86ad94

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