Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e297266ace87a5…

MALICIOUS

PDF

89.2 KB Created: 2021-05-01 19:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bfef61d807abed2669149b6627d65c0d SHA-1: c3b189ae9d753479e1fce5c631dd02dffdf8aeaa SHA-256: 42e297266ace87a5835b417134e027bdffd7bf356bee4063f12abb5012e03546
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains an external URI and an SEO redirector link that leads to a phishing site, likely intended to trick users into providing sensitive information. The document body, though heavily obfuscated, contains text related to 'month end closing process' and 'invoice', aligning with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zajinet.ru/strik?utm_term=what+is+month+end+closing+process PDF link annotation
    • http://alcozerox.com/tribe_archipelago_exfilm_presets_free_downloadeabsb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_6029ebfb2a73b.pdfIn PDF document text
    • http://igafnd.org/robert_adamson_202085kzl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5fdefb9af3133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_6011b630c83a5.pdfIn PDF document text
    • http://atlas-copco.su/will_i_lose_weight_on_alkaline_dietfcxxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_60478226572b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_603fd2e957fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_604317a481141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_601dcda0a3b7c.pdfIn PDF document text
    • http://itsnat.space/gregorian_calendar_date_format_javascriptcg7ob.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/wutisigila/54985223464.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/lezedaposizeza.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/handbill_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/79790771758.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/kubozogatosoruwogafemomu.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/39135553930.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/how_to_learn_measure_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/64132633698.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/31672116636.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/29177709068.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/luzewoputo.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/xonujog.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/vawuwopelobozawenebo.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/almug_icon_pack_5._8._0_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/bomenudizuwuvugodugum.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_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 5500 bytes
SHA-256: bff3638dbd110b28b751f29d8fd10d23df5c76c14e941dd91b3fbc8d133e7d24
font_01_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 11124 bytes
SHA-256: 3bedb57e48769beb318e0a2d63eb6f339e6453cc2db18fb111f05bf24d880497

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