Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd31d848f349b68d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-23 05:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: df6297b5d1ef8784e1b33353788d30e6 SHA-1: 2d9ebec5418856b77490bd82645b58c9682446a0 SHA-256: fd31d848f349b68d5d68d177373494fe6ef7f00e22a7204b37b756247fcf416e
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are flagged as malicious or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'call to action button wordpress code', suggesting a deceptive lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=call+to+action+button+wordpress+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_6029aa1ded14a.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/aswb_masters_practice_testdie6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_60155497c0707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_602e6efd4430d.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/venesifesezan.pdfIn PDF document text
    • http://bachanalytics.com/apple_books_vs_kindle_pricesbxlfj.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/cb6iakv/zefirimowowijopijepoma.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/3205205.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/dcjjv9A/pekezoxapewotu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419433/normal_5fcf695a22fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_600ae6e82a04c.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/hjc5kic/need_for_speed_most_wanted_pc_2005.pdfIn PDF document text
    • http://omoikiri.info/androides_sonham_com_ovelhas_eltricas_epubo1lnq.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/hbggAdj/dalupixoraju.pdfIn PDF document text
    • http://italdom.fun/consecutive_odd_integers_word_problems_worksheeteks4k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ff31c1898a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_603321c731019.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/joterige/40654132580.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/animation_wallpaper_for_desktop_free.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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 5204 bytes
SHA-256: a34e5b39e683e5a791ed5ad52e18ebc3911b8be84d2e849c9634d9a1545914cb
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10484 bytes
SHA-256: a5b06a2687bf0d95a4586c07f7a5e7e4f63cdb90092e1164e3b9f997c29f6adc

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