Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a23885286082ce8…

MALICIOUS

PDF

110.2 KB Created: 2021-02-17 18:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f5a9a400c52c2fa5d84fcbb11b29abc0 SHA-1: 846c87e6532b2b0dce27f0110f8c211db3f7f116 SHA-256: 0a23885286082ce8c231bed80efa8fd1b8c1e1de310b6ffe9c370e19b7637aa6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of the linked URLs, 'https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/jenemafosiwufonexaxe.pdf', is part of this link farm. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan-like behavior. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://bologen.ru/123?utm_term=drum+rudiments+%2526+musical+application PDF link annotation
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/jenemafosiwufonexaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485015/normal_5fe256a14fd8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_601e9810a688f.pdfIn PDF document text
    • https://rovinimowi.weebly.com/uploads/1/3/4/6/134682499/fevejavarokokuxufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_60223131a23d2.pdfIn PDF document text
    • https://lidajegufevu.weebly.com/uploads/1/3/5/2/135299661/mofogumutinaveb.pdfIn PDF document text
    • https://maninuwag.weebly.com/uploads/1/3/4/5/134577581/1288bf4e9ea92.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/fa4d22caef09e5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/comic_book_template_adobe_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/low_platform_sandals_steve_madden.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/ignou_solved_assignment_2018-_19_free.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/kekibena.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/block_letter_format_in_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/boxuri.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/8045759059.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16486 4500 bytes
SHA-256: 44d22085f1e3d68f4f2d098952037527aa2d8d4241e6ad4a655358f886c2fee3
font_01_sfnt_off000173ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AB 13100 bytes
SHA-256: e74e087924876e46c1d4e27cfb3daf0d0a6e3a97fe7d648b0f2259f036b03ab7
font_02_sfnt_off00019d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D6F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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