Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a13c91b42fddabf…

MALICIOUS

PDF

94.8 KB Created: 2021-04-05 13:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3538ee8e26a8b8335517655c1af5bd1d SHA-1: 0a3a4b22ba0e296bfb351b5013634114e89ef6f7 SHA-256: 6a13c91b42fddabf366b7fdad1a4b9ddc9a875644d97de1fdae8b05041e5de5b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+write+ap+language+rhetorical+analysis PDF link annotation
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/pisavaxi.pdfIn PDF document text
    • https://rupekiduwixe.weebly.com/uploads/1/3/4/7/134774185/pifuziz.pdfIn PDF document text
    • http://laxeded.iblogger.org/fiwirevuluzufunasizil.pdfIn PDF document text
    • https://popivuzumozula.weebly.com/uploads/1/3/4/5/134500063/8014673.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/production_de_l_acide_sulfurique.pdfIn PDF document text
    • https://rafafokisot.weebly.com/uploads/1/3/4/7/134738004/4979778.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/program_to_annotate_free.pdfIn PDF document text
    • http://bodagimama.iblogger.org/sotokojagugagoxira.pdfIn PDF document text
    • http://tinizorejit.22web.org/bundesliga_spielplan_17_18.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/vutam-xelati-kasitenaxap.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/capital_structure_management.pdfIn PDF document text
    • https://jatibamed.weebly.com/uploads/1/3/4/6/134649143/3717258.pdfIn PDF document text
    • http://naligixe.getenjoyment.net/general_mental_ability_reasoning.pdfIn PDF document text
    • https://zibakuponitek.weebly.com/uploads/1/3/5/3/135303957/zobukugut.pdfIn PDF document text
    • http://baxemoge.iblogger.org/disgaea_2_dark_assembly_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumawasisoxo.rf.gd/onkyo_tx-nr777_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b506595-2abf-4289-9e8b-a292b226413b/rifezuvitowa.pdfIn PDF document text
    • http://zanawolusebil.epizy.com/verikifadanomew.pdfIn PDF document text
    • http://tawatibajat.rf.gd/47471928171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d519d8e-1a67-4b19-92f6-8d7a790996ef/the_bell_jar_movie_netflix.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/schneider_ats01n222qn.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/gartner_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf7860f-1afd-427b-8ef4-4292b5f0c920/84880195966.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 6672 bytes
SHA-256: 0b47c4f5659882b3d51e64c73369df5eccd6945498ca99d71b04aa2861aec378
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 5352 bytes
SHA-256: e36a2ca901cbd8fc1ee5ebade5e0342b63253a82caea6386fcef232e25d790f6
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 6600 bytes
SHA-256: 2e4ba3d6e20b2110213f4bbbdba2fef6d75f2d59f9731bc2d10244085b74ab1b
font_03_sfnt_off00012f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0F 11268 bytes
SHA-256: 72bf9b8d949ee61c771380e933bcc4fbe9cecac4b675d3484ebf7670c368d588
font_04_sfnt_off0001558f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558F 16492 bytes
SHA-256: 213e803776634fc67bc8ad945e15daaee647097fae9af9fe9f57f081dd30af55

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