Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d55ad9255ebeac…

MALICIOUS

PDF

78.9 KB Created: 2021-04-24 06:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce64ee31f5c07e91e0c811cf41b790a5 SHA-1: e445f348ec26f9b820c2df4df66e20ef692dd739 SHA-256: 80d55ad9255ebeac0db9269a6d8b57a522720b253cf4e59e7428bc338389d013
116 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating a phishing or trojan. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern. An external URI pointing to 'nipisod.ru' was extracted, which is likely the malicious destination. No scripts were extracted from this sample, but the overall pattern suggests a phishing lure to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=mobile+home+coleman+furnace+parts+diagram PDF link annotation
    • http://nemosixumeki.mypressonline.com/causes_of_acne_vulgaris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_602387ff1a6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_605ffd704187d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_604ade2b0e8e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_60221f28572eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47577b5-d756-4370-9f87-c7b1073dd44e/kulopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5f366f-9eee-46e1-86fd-0ad3a11a2b0c/ruxokunogixovotexibojino.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/application_form_of_marwari_college_ranchi.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_4c4b541282924ecb8323e96e50d0b311.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/what_are_metric_measurement_units.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_fc46185a40d84a5294c163b142d0f7f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/fekupo.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_de2bce2250884c3f8824d4e654331f20.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_716881fcd2f1477985c40fb05a4c6d09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukut/urdu_calendar_2018_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6586263-1ddb-4728-9162-67aaf5056c5e/walls_of_limerick_grade_5.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_406de045dda4466790f5f6f18c2b2f4a.pdf?index=trueIn PDF document text
    • http://girofili.myartsonline.com/91319983711.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/application_format_for_phd_admission.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/change_adt_alarm_code_safewatch_pro_3000.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/quran_for_mobile_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/catholic_biblical_commentaries_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e4d07d-6e09-4b6e-a2cd-102d72c321a8/the_maze_runner_2014_full_movie_dual_audio_download_720p.pdfIn PDF document text
    • http://paxerakomis.onlinewebshop.net/digital_electronics_book_by_godse_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5716 bytes
SHA-256: a43b115f646de4f0504a29c6db60410d59dd3ea32d0647655d9496920e58a9fc
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 10612 bytes
SHA-256: be596b7f5bfbc9b2f07887c4cbe2290ea4bb0f9186347455e406836f63486f02