Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f9239c48fb19e8…

MALICIOUS

PDF

81.5 KB Created: 2021-03-15 02:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99a606be444a2d93f823e3402658684 SHA-1: 77aa5c896eaf19d62e593e333947c26f1491f116 SHA-256: e5f9239c48fb19e896c6213f24fd1bce44b7d2a8e7278a0693b02a5a9be57501
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on potentially malicious domains. The primary URL, 'https://pelibifir.ru/wix?keyword=multiple+lovers+persona+4', suggests a keyword-driven lure. ClamAV detection and ML classification confirm the malicious nature of the file, likely acting as a dropper or redirector to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=multiple+lovers+persona+4
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/diwonixu.pdf
    • http://desepevadijowu.22web.org/clay_brick_making_business_plan.pdf
    • https://datamabijiremu.weebly.com/uploads/1/3/4/6/134691522/3503269.pdf
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/1398172.pdf
    • http://motovepom.iblogger.org/ginanekoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pexedidal.rf.gd/tiduxegorodu.pdf
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_67bb2bc50fc0402889756cfbd32dda4c.pdf?index=true
    • http://jijabivu.epizy.com/introduce_yourself_worksheet_students.pdf
    • http://firixafuzive.rf.gd/home_depot_vinyl_sheet_flooring_installation.pdf
    • https://uploads.strikinglycdn.com/files/90a67b37-a8c4-4d7d-a849-f456581c68b0/mel_robbins_stop_saying_youre_fine_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/aecd296d-500f-45bd-a823-26dc2bb94325/55484167233.pdf
    • https://s3.amazonaws.com/nakevoja/lawrence_taxonomy_of_vascular_plants.pdf
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_41301e287cce4a2aa2e822feb00766ac.pdf?index=true
    • http://gefutikavuza.epizy.com/avengers_cartoon_movie_in_tamil.pdf
    • http://modiwina.epizy.com/putuvoxuludulofap.pdf
    • https://uploads.strikinglycdn.com/files/87585459-5199-4b1c-9848-4217d87f1b58/line_6_spider_jam_75w_review.pdf
    • https://s3.amazonaws.com/joterige/chateauform_la_borghesiana_romana_website.pdf
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_fea420ba08004612bf9da97020411df2.pdf?index=true
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_19b0b09937b5418993a2a855ad5c307f.pdf?index=true
    • http://tasibufoz.rf.gd/siwaligogod.pdf
    • https://uploads.strikinglycdn.com/files/356a5812-7509-44ad-8410-10a705b2e49c/77483221217.pdf
    • https://uploads.strikinglycdn.com/files/8770e176-608e-46cb-86d0-282f44b7d6ca/kidde_smoke_detector_beeps_3_times.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f610.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 2900 bytes
font_01_sfnt_off00010053.bin
d6c0b33b260d4b71d618c7af6810e0d8532adca4ca2324e81fed81e8b5fd2d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 4964 bytes
font_02_sfnt_off00011159.bin
dddbbc48663a8c8ed12e42e77f873e62ac761a98392754c6b1cce4d19ecd58d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11348 bytes

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