Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7e6fd2ea28016e…

MALICIOUS

PDF

97.1 KB Created: 2021-02-11 14:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 77cbb00617853f20aafe2b5e647765c0 SHA-1: 23d1fdca4282fd17728c9d020a8719c2ee6059b7 SHA-256: ea7e6fd2ea28016e0bfc35ad986afc234bd061a8e1acc383c17b5fcfe8f775e5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a mass of external PDF links, suggesting a link farm or SEO spam operation. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=little+nation+and+other+stories%25E4%25B8%25AD%25E6%2596%2587%25E7%2589%2588 In PDF document text
    • https://cdn.sqhk.co/susojitigi/gingdli/6820298428.pdfIn PDF document text
    • http://doxugivo.22web.org/states_of_matter_worksheet_middle_school.pdfIn PDF document text
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/f13666bd.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/boxufi-bawiworujem-rakifof.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/bajiwin_zadijijari.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/hehjRRR/longhorn_eclub_sign_up.pdfIn PDF document text
    • http://businessoutsourcing.info/56994592959xdhmn.pdfIn PDF document text
    • http://rastet-malysh.ru/61983794467easor.pdfIn PDF document text
    • http://euroshopme.site/litubijemanuvovixegeriwiegvzu.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/doAbgi5/49805142301.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/somamere/sugijelut.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/xakupaje.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/lopizupivisegusowuxaxase.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/handshake_math_problem_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/difference_between_broadsheet_and_tabloid_ks2.pdfIn PDF document text
    • http://jujodixawo.rf.gd/tirolowepebunukira.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12750 3112 bytes
SHA-256: 3cddec2305c16a796404b68c1ea0536cc8b48d84c9f6323722aed027c6df3860
font_01_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 3392 bytes
SHA-256: 35b83af9119d8bc690fdf917dd8ed0d166835848d75bbbd3e8b3f7218e5cbb0f
font_02_sfnt_off00013e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 4856 bytes
SHA-256: 48cca93ef1da73a23db4a28e97a1b65ce6ec2daf69da196813fb5ead1612399a
font_03_sfnt_off00014e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E93 11120 bytes
SHA-256: 62eab510dc9c0c6388bfc743ad0bfe826ec0bcd2512bb6e3a38ce30f1653031a

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