Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0042021fc6cd76…

MALICIOUS

PDF

82.5 KB Created: 2021-02-23 05:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 71d96b99bb87b7864b218f309cb5b71f SHA-1: 2b81cca058a02aed0e4db795d5030f5ab3bd60d1 SHA-256: ae0042021fc6cd764ca007e010443d4c4ecd4c228160b70ad6b308b7fcd8bbc5
224 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a Facebook account recovery prompt. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic for social engineering attacks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://crophysi.ru/wb?keyword=facebook%20recovery%20account%20password In PDF document text
    • https://cdn.sqhk.co/bigulikexupa/tieFjdF/19480754562.pdfIn PDF document text
    • http://naturagrush.space/724413758131h0wu.pdfIn PDF document text
    • http://odemebayisitrafik.com/39692624090dng2j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fe36c6711086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_600c6a8f6f70b.pdfIn PDF document text
    • http://curvepreloved.com/47454751675oqohe.pdfIn PDF document text
    • http://proita.space/steep_trophy_guidekiypp.pdfIn PDF document text
    • http://instapriz.site/4399_naruto_vs_bleach_1.8sb9g7.pdfIn PDF document text
    • http://rukozhop-guide.com/what_are_the_applications_of_big_data_analyticspatnq.pdfIn PDF document text
    • http://migerov.xyz/96867902131qejkf.pdfIn PDF document text
    • http://shoop-fo.ru/modded_cookie_clicker_savecyan1.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/5Mbkjaz/free_download_bubble_shooter_classic_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/refowofiros/VoCihaN/53200176152.pdfIn PDF document text
    • http://sewulege.22web.org/rotational_and_line_symmetry_worksheet.pdfIn PDF document text
    • http://chebsvet.ru/xepurugasafugedou259b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_6000979298571.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/gogoxowiniza/21968104055.pdfIn PDF document text
    • http://wubavon.epizy.com/62317473123.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/jugukowelawidebilitaw.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/13829118110.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/2292521280.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_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 5448 bytes
SHA-256: a0476a42f29f0be9d55738ad3793dd1e7f78b8180298730c301581921563ec95
font_01_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 11388 bytes
SHA-256: 9c49dad3554fdc342ecd3e4a9a3759d3a7450cef9aacfdb791d83408a121a831

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