Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ca9e4ac6067b21…

MALICIOUS

PDF

74.6 KB Created: 2021-04-08 04:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 430b5f136b17786d7501c9fb15dab651 SHA-1: 1ee0f52b4c21c71384bde4bf92e92b40ac7c64d8 SHA-256: 83ca9e4ac6067b212ac052e14e94c34dbac6f470cabd2da532fac0956e018a2d
186 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, characteristic of a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic firings suggest the document's primary purpose is to drive traffic to these external sites, possibly as part of a phishing campaign or to host further malicious content.

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
  • 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.
  • 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://resalured.ru/wix?keyword=vhl+answers+spanish+3+lesson+4 PDF link annotation
    • http://idealslimitaly-official.site/3642992430sm98h.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/saduvol.pdfIn PDF document text
    • http://greatholl.com/femudutogiweryk65y.pdfIn PDF document text
    • http://reguvixelupuj.iblogger.org/sennheiser_ew_100_g4-835-s_1g8.pdfIn PDF document text
    • http://callipakk2.site/popular_poetry_books_202022s5i.pdfIn PDF document text
    • http://rodina38.ru/a_difference_between_business_ethics_and_social_responsibility_is_that_business_ethics_quizletuecqo.pdfIn PDF document text
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/642fd0c17c49a11.pdfIn PDF document text
    • http://hugertely.xyz/microsoft_word_2007_templates_free956kr.pdfIn PDF document text
    • http://sale-siberian-force.online/boast_meaning_englishz3egb.pdfIn PDF document text
    • https://sikukaposarimi.weebly.com/uploads/1/3/5/3/135307882/314eabf3.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/7230901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pobikifi.rf.gd/emitra_rate_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc00bd2-edb6-4309-b87b-653a12b6f582/managerial_accounting_11th_edition_chapter_4_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dcde1de-571c-4252-9961-2f5e9731c6fe/how_long_do_you_cook_a_frozen_hamburger_on_a_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567f87b7-b49b-479b-84a5-ed4cffa09e85/how_to_clean_stinger_bug_zapper.pdfIn PDF document text
    • http://menikax.epizy.com/11712427486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3816f4f6-f822-4ef7-8c88-b71c3fd9b401/titobisubuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2070aa-d191-4038-b1c4-c9c957aa3798/saputukakebejer.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 5216 bytes
SHA-256: 2c95c1c77d9fa7dd71ecb79528c808ab61a0efd894e25bf3602b64f7a733301f
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10812 bytes
SHA-256: bfedf5637e3bd3d5c2a8ca241c03b0591087a9d522605125297953a8a789f885

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