Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4afad44dc4de6c7…

MALICIOUS

PDF

90.6 KB Created: 2021-03-29 23:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 409e24fdf9c99d8cf001a9a61c0aad7b SHA-1: 10311ffabc7362b8379d1888533f44b59a12b679 SHA-256: a4afad44dc4de6c704c6619b3bebe8e3e56674d696eec94c33416c394401b730
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 0.9983

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://kuzutuzo.ru/strik?utm_term=ways+to+pray+for+your+future+husband PDF link annotation
    • https://cdn.sqhk.co/gafokoru/chb0jbF/custom_sound_button_uk.pdfIn PDF document text
    • http://teksalon.xyz/reraxuturilusotov4xry2.pdfIn PDF document text
    • http://arthromedro.xyz/zitolarodv5poy.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/de713e.pdfIn PDF document text
    • http://hookup671.site/monster_vs_aliens_full_movie_in_hindi_dubbed_watch_online_freet4scs.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/iask82i/formal_languages_and_automata_theory_flat_notes.pdfIn PDF document text
    • http://jilet1.club/irs_earned_income_credit_worksheet8189h.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/mudulanunezezusad.pdfIn PDF document text
    • http://huseyincanx.com/89505076085zk6mm.pdfIn PDF document text
    • https://fivomatimib.weebly.com/uploads/1/3/1/0/131070631/9bc62a5fe69.pdfIn PDF document text
    • http://unityfree.xyz/329185676457lnyb.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/wasupewepalokezuju.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/jfnjgAY/7599559959.pdfIn PDF document text
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/maposesevivug.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/fdzhbhc/27977890879.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/gcKiege/ganowuxatope.pdfIn PDF document text
    • http://sushibara.net/690156034914t2tj.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/zomajikalapa-vitid-voniges-tituxipupelo.pdfIn PDF document text
    • http://dwatches.site/50561502626wtjt9.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/kefefetafij/49328053466.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/zuwozofal.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/why_do_i_have_one_long_white_hair_on_my_face.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/psc_bulletin_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/85253408957.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/85723951157.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 5352 bytes
SHA-256: 069fc963185d48757b7831b975f95512a73ca593271cdd17cc6bb56c52615241
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 11268 bytes
SHA-256: 356354dd8d007fd980a311adf9e5225b841bdc5228848cec7bee532da1123750
font_03_sfnt_off0001464f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464F 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660