Malicious PDF — malware analysis report

Static analysis result for SHA-256 226dcbc61d61888c…

MALICIOUS

PDF

193.9 KB Created: 2021-03-16 20:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: af4eab88d74fb7bdf915433dc332d52d SHA-1: 5d79d6d1b4d5903d963fcd5e898df75111e9dd63 SHA-256: 226dcbc61d61888c2e455f06b77f8e3ad924532851782dccad4bbd081005703d
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Cardan shaft design calculation pdf'. The presence of numerous links to disposable hosting further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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
  • 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 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.
  • 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://dafemum.ru/award?keyword=cardan+shaft+design+calculation+pdf In PDF document text
    • http://kurs1.xyz/17194150879682m1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5fcd70768eb95.pdfIn PDF document text
    • http://esclub.pro/38931899424gsn3u.pdfIn PDF document text
    • http://lesitegu.iblogger.org/how_to_change_the_price_on_a_dixie_narco_vending_machine.pdfIn PDF document text
    • http://chambreapp.xyz/setejogopevitabuka270kv.pdfIn PDF document text
    • http://zolekumosex.iblogger.org/ph_acids_and_bases_worksheet_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455370/normal_5feff45738bed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465701/normal_60071948dfd52.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/65711622636.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_51c2676f4bc04a88ae7f8979981a8283.pdf?index=trueIn PDF document text
    • http://kopolug.myartsonline.com/crockpot_2.4l_slow_cooker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc1db2a-a6d0-4542-8f37-8d82e346ab68/86785282122.pdfIn PDF document text
    • http://xurorovesi.epizy.com/calculating_gradient_worksheet_earth_science.pdfIn PDF document text
    • http://kunibenurupamiv.rf.gd/simplification_and_approximation_questions_for_bank_po_download.pdfIn PDF document text
    • http://deweget.rf.gd/emergency_medicine_journal_case_report.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_a2ad7377cf7e433b963181e0f13a1988.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1f0e89-5cd8-447e-a86d-1b40ad87a479/nupepaxemosotej.pdfIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/alcanos_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6743e56-ed5d-4bd7-8413-759d03c62648/udi_u818a_wifi_fpv_rc_quadcopter_drone.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
stream_005_off00025f81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25F81 18352 bytes
SHA-256: 2cf5e4f5b2c0ccb4ae8136135cea2b86a268ba774ae2746c735b0c3fef871b0a
font_01_sfnt_off000293d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293D9 2308 bytes
SHA-256: ce5ab9f975b8938cd35db12ac4a7b0d076f51cb6c4e01ac90ddd24c661694de5
font_02_sfnt_off00029e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E1C 5320 bytes
SHA-256: 941a488c1d36e36d3c031e8af3a5272bae0ca18ae43b49204995b65ad198e724
font_03_sfnt_off0002b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B032 14292 bytes
SHA-256: 3269ee9f21c5273702e37613b4362654d7a92767154e575c9be46801868abfd5
font_04_sfnt_off0002e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E094 16724 bytes
SHA-256: 22eedae8bed7164c5f2fd71a45daa65393af01f0fae56e554b2b1fcfb3f81ec6

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