Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae59cd0d86b009ac…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 10:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7dc7732364fd51cb2aad3a594b137b05 SHA-1: de22e1c625bc141841d525fbb24f3efe7f0ec500 SHA-256: ae59cd0d86b009acd46569a33b641121ca65992fd48896ea8ff66bd7a0850190
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 a large number of external links, many hosted on disposable domains, indicative of a link farm designed to manipulate search engine results. ClamAV and ML classifiers identified this file as malicious, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious websites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=format+usb+stick+ntfs+allocation+unit+size PDF link annotation
    • https://cdn.sqhk.co/puvubuzu/8B6MxlH/pinball_museum_las_vegas_nv.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/b2661286bf50.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/cR6Kgf5/vavezugadimezuvojowotub.pdfIn PDF document text
    • https://gijesilikisuzid.weebly.com/uploads/1/3/2/6/132683000/telubogutoduwexejara.pdfIn PDF document text
    • https://lizoxezubim.weebly.com/uploads/1/3/0/7/130776499/062c6d574b1c.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/RfDhfje/merchant_of_venice_summary_act_2.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/ghjHihY/kulaludax.pdfIn PDF document text
    • https://cdn.sqhk.co/nuleneru/gjieFgi/djay_dj_app_mixer_apk.pdfIn PDF document text
    • https://xukovefekafevut.weebly.com/uploads/1/3/0/9/130969731/bojix.pdfIn PDF document text
    • https://pezevibasa.weebly.com/uploads/1/3/5/3/135306661/57a51ac3f5d7.pdfIn PDF document text
    • http://get3creditscores.info/kikemudutatuwesumi83nap.pdfIn PDF document text
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/5038575.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/lupotuzutikufi_fenovibus_tuzuwowasavixo_wuxiriluf.pdfIn PDF document text
    • http://ampinternational.org/p21_n_space_group_explanation6pjza.pdfIn PDF document text
    • http://giocodigital.fun/curso_de_fotografia_nikoncqmlg.pdfIn PDF document text
    • http://purpless.vip/bawokumiburukemubideleporhpfz.pdfIn PDF document text
    • https://fuwemuwiwogul.weebly.com/uploads/1/3/4/0/134016804/wojatixipurizi.pdfIn PDF document text
    • http://kushtanash.ru/gelaxelolekesilaxonupidit0qaj.pdfIn PDF document text
    • https://sefoxobifi.weebly.com/uploads/1/3/6/0/136093232/zominez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8757f1-9720-48fb-be6c-aa4dd70b1210/is_logitech_m325_compatible_with_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9972293f-9967-4627-a6a5-452821c793dd/maserati_granturismo_sport_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e54b83-9332-47e4-8fb9-92cfce1bc5e8/mupivofeminozudunuwirefet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd12043-a80a-446e-b46b-aabd3e0d7f04/34194093378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8524cfaf-d92c-429f-8098-35e7286d06eb/adca_computer_course_notes_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1654e471-e12e-45e4-a1af-4f19ad24c675/64499540771.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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5236 bytes
SHA-256: 31a58149535b64389e3c5b7f1d25de1da32450af1734f69edee349cef15cbae9
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 11216 bytes
SHA-256: ef27fb4291e92be484f47b3b515232d41eb3925db6984a109bf0de58e01ec3ce

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