Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cfc2e93e2549da…

MALICIOUS

PDF

90.9 KB Created: 2021-04-03 21:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1e0c6c47ba611a2748d62cddc837d383 SHA-1: 25e78a0345300f613a09cb52ef47242d20615f9a SHA-256: 77cfc2e93e2549dae20e16eb43c6caf2d9f018340c22ae217e49a1a878a02e29
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'ponafet.ru', suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic and a callback lure further supports a malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=10th+new+english+book+pdf+download PDF link annotation
    • http://xigotazuwal.iblogger.org/unicorn_birthday_party_invitation_templates.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/animetv_apk_modcwfxi.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/1216241.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/3524710.pdfIn PDF document text
    • http://upgrade4me.com/137980239981w87y.pdfIn PDF document text
    • http://podjem2.club/zitopefyzqa.pdfIn PDF document text
    • http://vonokumi.iblogger.org/basic_electricity_worksheet.pdfIn PDF document text
    • http://fumufede.iblogger.org/wopuvolixiredewegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/liwafo/hp_officejet_8600_printer_-_ink_system_failure_error.pdfIn PDF document text
    • http://piperopire.rf.gd/baxijarati.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/2014_jeep_grand_cherokee_service_air_suspension_message.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/esc_guidelines_myocardial_infarction_2017.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/amendments_in_gst.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/najazowanixetokuwojudi.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/wisoku.pdfIn PDF document text
    • http://tutakaxebi.epizy.com/an_ember_in_the_ashes_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/quotes_from_dry_by_neal_shusterman.pdfIn PDF document text
    • http://mudopijafaj.epizy.com/visual_studio_android_emulator_localhost.pdfIn PDF document text
    • http://nifuwisenomu.epizy.com/hematology_analyzer_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/94093137317.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/37623094744.pdfIn PDF document text
    • http://fukokikedusej.epizy.com/jebiwazodimupesewagov.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_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 5392 bytes
SHA-256: dc4d94ba3ecb6c634d8c41df9ee43cab5f26f30909087f45e4ef1e229148b2cf
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 13236 bytes
SHA-256: 56e7bebb8ffd3de465937b181fbf6d3f4cfc2087f035ce53d628ee36446746a8
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 11872 bytes
SHA-256: 036d4b5eacd65a2d259f0ededaac204dacbe70b122de63c61cc920f53866692a
font_03_sfnt_off00014fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2