Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a50a1022299bf7…

MALICIOUS

PDF

77.7 KB Created: 2021-04-06 10:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4889215feb128e0baeb8eeae788be48a SHA-1: 574a411412a8796e779f047c973be594365c8a60 SHA-256: e2a50a1022299bf715ed897bfe33813008439cc55e3c8fd69044d926304123bc
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 0.9996

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://resalured.ru/aws?utm_term=acetic+acid+is+a+weak+acid+in+water+because+it+is+group+of+answer+choices PDF link annotation
    • http://sopidemeleket.mygamesonline.org/94317527574.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/bible_quiz_judges.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/61959283846.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/north_carolina_durable_power_of_attorney.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/xozilefewojuvonunewososu.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/simple_pencil_drawing_images_step_by_step.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zelovavatag.rf.gd/list_of_jesus_miracles_in_the_bible.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/the_economics_of_money_banking_and_financial_markets_online.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/rulemaxe.pdfIn PDF document text
    • http://dukanikurov.rf.gd/hoi3_black_ice_manual.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_6e2c055c923942ae8bb62ccc39d012a0.pdf?index=trueIn PDF document text
    • http://baxutuzimux.epizy.com/network_cabling_standards_and_practices.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_4030369b4a134a40a354d9ce107a2124.pdf?index=trueIn PDF document text
    • http://tikomiwewo.atwebpages.com/peavey_vypyr_75_clean_setting.pdfIn PDF document text
    • http://rojetakaju.epizy.com/line_drawing_book.pdfIn PDF document text
    • http://kekusilubuf.epizy.com/tracheobronchial_tree.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/98242549631.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/centrifugal_blower.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/ncert_accountancy_book_class_12_download.pdfIn PDF document text
    • http://rezexoguseg.epizy.com/3415276920.pdfIn PDF document text
    • http://fezobuvetole.rf.gd/julian_of_norwich_prayer_card.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5552 bytes
SHA-256: 13535069194f99024d7186fb2792e76d1a738413489787fae50e2e504b2e2a8a
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 10636 bytes
SHA-256: 6c020520721a264afd437281c2b75c6e985b91b04f302c41c028a28c23cad16e
font_02_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333