Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a048223731d74f6…

MALICIOUS

PDF

92.0 KB Created: 2021-03-13 16:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a12eeefa21a6259860ebfeee26dd1b3c SHA-1: 1cb66e60e8de3505caf85fed5c1b3f75bd3aa3fb SHA-256: 9a048223731d74f6a26f0fb72bf6b40455973d101100262d60bd8fe144a55d04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

Heuristics 5

  • 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 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://zajinet.ru/aws?utm_term=descargar+anthony+santos+popurri+vol+1 PDF link annotation
    • http://nenegifivujaxu.mypressonline.com/what_is_the_most_common_city_name_in_the_world.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/bidino.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/cd8087ea364.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/gagup.pdfIn PDF document text
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/4996258.pdfIn PDF document text
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/felebepewuxukav.pdfIn PDF document text
    • https://zufikuwokuz.weebly.com/uploads/1/3/4/5/134522796/4325845.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/70e4cc4f41542c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvuxejuv.myartsonline.com/verbe_etre_et_avoir_en_anglais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655e40ce-f97a-4d1f-a810-9d5813e07290/meaning_of_margin_of_safety_in_business_studies.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_ad7545755a4a4eb2b4075af19de0bd19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/fudefafebes.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/4957357348.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/sajovusokonobasoruzogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61631d14-0d44-41c6-8da5-82cf5b9301b0/18381984233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9e7134-ec5f-40d4-a877-83d54aff66f8/can_i_put_r134a_in_a_r12_system.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/lejogaba.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/bsc_nursing_full_form_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596a1cd8-39d0-4011-8746-084eee6fbe7b/harvard_law_clerkship_cover_letter.pdfIn PDF document text
    • http://timerojulawu.myartsonline.com/ganpati_atharvashirsha_marathi_download.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_7d468616ad07462c8a02978a4225e594.pdf?index=trueIn 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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 5408 bytes
SHA-256: 4f4c865226b7722ae874773a538873662585a876ffecc98b08f834fd24e32f7d
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 4728 bytes
SHA-256: b044a2ee2ccae886500ae9cc25c187f74885c118186b63d2d89737bbef8b035d
font_03_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 12680 bytes
SHA-256: 5e2e5c79c5da443d8b77fa3a98e5d4b6a5858eb40ea1a460d14a0a64d1feaef1
font_04_sfnt_off000147bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BD 17180 bytes
SHA-256: 07cb34b00b7d8cc8640cf9cd2e16338b0aefed2e4d1928b1e3c34ef080187915