Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b5df35f4842805…

MALICIOUS

PDF

83.3 KB Created: 2021-02-26 09:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 899fcf88248e569dc9291275563b239a SHA-1: 18d2ec5e1486ac576f48b42f0ebe298fd354787b SHA-256: c4b5df35f4842805b7fbca26ebc45d720abee143d3c9b48026dfb259eacc2eef
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, including a critical redirector link to 'yafferge.ru' and a link farm pointing to multiple PDF files. These heuristics strongly suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the PDF structure itself is designed to lead users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=bully+scholarship+edition+apk+rexdl In PDF document text
    • https://cdn.sqhk.co/towevefizub/pic1Zha/30466336229.pdfIn PDF document text
    • https://rumodabumuxe.weebly.com/uploads/1/3/1/8/131857513/turamodi.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/gerizelozivarupepi.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/Bbjjxib/78316617349.pdfIn PDF document text
    • http://begetus11ppz.xyz/1988_suzuki_quadrunner_250_statorp41fk.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/2022237888.pdfIn PDF document text
    • http://voztrans.ru/61949758864z4vxn.pdfIn PDF document text
    • http://mikrotikwizard.com/body_beast_bulk_schedule9tdy2.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/molararazotadux.pdfIn PDF document text
    • http://sesalon.xyz/boxing_combinations_heavy_bag_workoutn3m9g.pdfIn PDF document text
    • https://gefotumazemi.weebly.com/uploads/1/3/5/3/135331531/xoxukugoleki_gadunisu.pdfIn PDF document text
    • https://lemuwepino.weebly.com/uploads/1/3/2/7/132712354/53550ba50f774.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/wuvepilamamuse/how_to_start_artorias_of_the_abyss.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/didoxujoxak.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/basic_biodata_format_in_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/truck_games_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 5444 bytes
SHA-256: 7613f5e4bd3b45a01a8ba528c603295f99e163fa3f3ce18a0708f6b3bc9012a9
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 4340 bytes
SHA-256: 470c8bacbd67e12ff140ae1668a4deffdd2b9b25dafdf1b394059f8a8b60dc0c
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10756 bytes
SHA-256: c3273141a712df115b6a27df7603dd5e9c7698ff91d9f0214bb8561845e4ab6a
font_03_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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