Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2818724f4fb29e3…

MALICIOUS

PDF

84.3 KB Created: 2021-04-07 02:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 395ddeecff214ed35118a4bf3cf02bbe SHA-1: c472bdf38cd8dd5957277d148766d92a3ec89330 SHA-256: e2818724f4fb29e319a71bc7a8feabd7e81b701383be67e2e8e14d553c0e12b4
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to SEO-optimized PDF download sites, suggesting a link farm or phishing lure. One prominent URL, 'https://lozipotod.ru/strik?utm_term=linux+commands+list+with+examples+pdf+free+download', is presented as a free download for Linux commands, which is a common lure. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document attempts to trick the user into executing commands via the clipboard, further supporting a malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://lozipotod.ru/strik?utm_term=linux+commands+list+with+examples+pdf+free+download PDF link annotation
    • https://sovomebidug.weebly.com/uploads/1/3/1/3/131379042/kuvukusemig.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/butalezejorej-waxexekuromekek-vebanunobut.pdfIn PDF document text
    • http://pornbustyvids.com/feral_spay_and_neuter_clinic_near_me8thj7.pdfIn PDF document text
    • http://visiblawty.com/aula_internacional_1_audio_cd_free3ukiy.pdfIn PDF document text
    • https://zitujizu.weebly.com/uploads/1/3/4/7/134731650/b446eceeb.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/8628017.pdfIn PDF document text
    • http://streichpack.online/xuzutewinofipegbh.pdfIn PDF document text
    • http://expressvpn.store/the_day_of_the_jackal_full_movie_19740kdr.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/18a6dc38-1a88-47a5-8b3a-3836ed218ff8/kopekeripovexajegawu.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/27596048266.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/bangladeshi_gaana_song.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/69790290689.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/child_booster_seat_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/29478262816.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/vatulilejamamajeritem.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/2006_ford_ranger_3.0_v6_towing_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/newubataguzotejunitas.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/google_sheets_count_multiple_criteria.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/26068786573.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/mergermarket_global_regional_m_a_report_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725dd80c-eb7b-4ba3-b490-fdc14b371eab/99274874473.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/wemefotadirulaneresoxuziv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ebf40a-5cec-4cae-8269-e6a4a86a5cd7/38781441620.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/crossbill_guides_extremadura.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/xisulejesitima.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_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 5496 bytes
SHA-256: 0733ddbe1c50015c43067bf438f396e0d26370b6401649699e40e05b27bd5e77
font_01_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 11040 bytes
SHA-256: ca19ad80213f827125b19beed96e9cf1930bcffd09cf15c33bb81f12afe95cd9