Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d03f17afce1e964…

MALICIOUS

PDF

68.4 KB Created: 2021-02-10 15:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd1624a74a93eb082ec56867721fcb9c SHA-1: 5446b6a67291df4e62823eaac1bfc8c44948f486 SHA-256: 7d03f17afce1e964cabace8cdbdb78ec1b650319fa671ad85484ce2a14e1c2ee
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to link farms and redirector infrastructure, indicating a malicious intent to distribute malicious content or phishing pages. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to harmful sites or engage them in fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/123?utm_term=schumacher+ship+n+shore+10+amp+battery+charger+manual In PDF document text
    • http://vbruti.site/electro_homeopathy_books_free_downloadlyytt.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/geTuJgh/53133575975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fd8d53fd83c3.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/1576646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fddc02e3f08c.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/14002703407xaqpd.pdfIn PDF document text
    • http://opssmall.space/periodic_table_scavenger_hunt_answersy7ggm.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/fPcofa7/school_teach_learn_english_worldwide.pdfIn PDF document text
    • http://4gusevshop.space/aisi_1020_standardmoo0o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_6022cce9b36f1.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/sukedil/mogepukawupulasamisodetip.pdfIn PDF document text
    • http://bokubipojofoji.rf.gd/kufededakaxuxugin.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/http_filmywap_movies_com.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/sequoia_capital_pitch_deck_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/xetetoxovaramexomituwub.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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 5884 bytes
SHA-256: a6f1193d7d6651ebc30d4ef95930920980b5a63020888a6ed2aaaaf36863ff80
font_01_sfnt_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 10620 bytes
SHA-256: f7dd5f400fd2b69f4f5dbfdbbde20ec9fe478be0502c6bfc76daa000a40cd8d3

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