Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa520d7a1065fd8…

MALICIOUS

PDF

72.1 KB Created: 2021-02-26 03:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 900ccad589a83d1009bbdd700833a6c8 SHA-1: f61f1e5d6d7e46f1704abe346ec611abcdcb1507 SHA-256: 2fa520d7a1065fd8424407b21ed0580050cc512368b7f63c3623eeb01cb41453
276 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jottigo.ru/wix?keyword=nvidia+geforce+experience+not+opening+error+code+0x0001 PDF link annotation
    • https://cdn.sqhk.co/rorexamuviz/MJiehi5/touchgrind_bmx_mod_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/35kjgg5/tornado_warning_sound_download.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ePyQlw5/wijebutumomalutukoj.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/jegaj.pdfIn PDF document text
    • http://megahit.space/zobenobaperozenaropibukevngtpr.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/wixamupelinere/suwitewakeg.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/jackett_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/gmat_score_report_history.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/62689088860.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/company_portfolio_template.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/altaba_inc_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/malokaxexivunanemuvobesax.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/navidiropagikojatu.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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 5404 bytes
SHA-256: 05c09859c390b88d7148acf660cf42a75b44f54c68e2f42442daf1efd72c1316
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 9864 bytes
SHA-256: 99fa589451fd9819d8e197ebba9dfab13e546d95454a620969fcd9bb80f6365f

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