Malicious PDF — malware analysis report

Static analysis result for SHA-256 a081fa09c71b5792…

MALICIOUS

PDF

91.5 KB Created: 2021-04-06 17:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d0d88ab01baa005e5bd07471daca9ba SHA-1: 754a91672c0ad403328d4f4e931dcb7304b27b0c SHA-256: a081fa09c71b5792564bc681e19f3a5b42f7b24b156d7e24c853a137b1648435
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dafemum.ru/wix?keyword=idle+miner+apk+mod PDF link annotation
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/1aee1a0d2367.pdfIn PDF document text
    • http://wekeb.space/overwatch_lucio_boop_guidew1nki.pdfIn PDF document text
    • http://kubojep.iblogger.org/new_look_white_slogan_t_shirts.pdfIn PDF document text
    • https://cdn.sqhk.co/fujavuraleko/gqJAJhg/limiting_reactant_examples_with_answers.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/riluvomuxok-kikoni.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/h3Oiagj/duet_song_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifenax/ZojcpFj/jaragoxerugominu.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/dinadiralukefiwilovorate.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/anticoagulants_used_in_laboratory.pdfIn PDF document text
    • http://sportplays.ru/189144854729ldhc.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/015b7d7d0b75168.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/camellia_sinensis_plant.pdfIn PDF document text
    • http://fegikiji.iblogger.org/jimamogesiremidisol.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/bgjewjf/sipujivafuwipe.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/jj9ieO3/48808763832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_9d9ad792d2e14dab8c4543654d293ec0.pdf?index=trueIn PDF document text
    • http://tadufadimokoje.epizy.com/metallica_seek_and_destroy_guitar_tab.pdfIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_f88a399066524f619544df2376229126.pdf?index=trueIn PDF document text
    • http://lanosewidem.rf.gd/artificial_intelligence_lecture_notes_computer_science.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_24911fee3d7344af88fe897ed55cfb0f.pdf?index=trueIn PDF document text
    • http://sigamit.epizy.com/psicologia_de_la_salud_y_calidad_de_vida.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_5c4cb9a6ba9646268f0056e2e6fa395e.pdf?index=trueIn PDF document text
    • http://lugimeviguv.myartsonline.com/kosalavupoki.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 6804 bytes
SHA-256: e639276c7d894b780a9c15d6089d791b7f68d9cd1c872756df9d962d0a00103d
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 4928 bytes
SHA-256: 0fcceb79629acde2435edbc3576b0960a80ac986f60224d589de7353965db7bb
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 1776 bytes
SHA-256: 8580321a333bcc6026cfe0952ff05888494d95a708519ee34a3e380ecb2520b3
font_03_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 11016 bytes
SHA-256: 0de5d0da9473ade2fbfd6c4ee4fb1ea3a6587c4c49d801c46d5f1e9d12e4c68c
font_04_sfnt_off000149a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A7 16212 bytes
SHA-256: f674df70992b2b7ef244b35411aafc08606a6d4d8fba96e82fded9eb90ed0ef3