Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a0bee9183127a3…

MALICIOUS

PDF

73.6 KB Created: 2021-05-26 00:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 892e3404801a0ff6cee5d16db5a3484e SHA-1: f89a3dae67facdae39247d7c983641e15e00b0d4 SHA-256: a1a0bee9183127a3317add22dc40792c20d58f0008a55a05b25026461358317e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('jottigo.ru') that is likely used for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=twelfth+night+folger+pdf PDF link annotation
    • https://gadofipod.weebly.com/uploads/1/3/6/0/136056298/8f70d033c6a960f.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/vebigimopepewev_kafumukixex_sewegesedolod.pdfIn PDF document text
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/sufupufopuwovumapu.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/18dac105-2d68-49a8-9332-053d992a46d0/bifiruwirosiremivufajede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbacf2c2-4291-4a50-8805-c90db95d76be/hayward_cl220_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/aircare_maf1_replacement_wicking_humidifier_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/how_to_put_a_million_dollar_baby_crib_together.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5b6f73-6742-4748-bee7-1e399ff13131/metodologia_dela_investigacion_hernandez_fernandez_baptista.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/fizefutunosejowupik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301bfbd9-ff58-46a7-9acd-bb27d7c1d039/vewef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33506fc1-9353-42e4-8c4f-cfc8bc2dd7a0/jasat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5858ff9-c2d0-48a8-91de-33bd5f88895d/25986248089.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/61283091569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c3f6ba-2ba5-4ec4-a459-e8e1f7fdcb55/51116189355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352f82f2-260c-4f4d-8814-ff81e08a482f/singer_futura_ce-100_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/celtx_script_app.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/40541926153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d736fe38-c58f-4d49-98bd-71ad77ed1054/53253436775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0616d4df-7368-4c13-9d3d-1b43df6e66df/weight_loss_workout_plan_for_beginners_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92df580f-a4c0-435f-ab66-2665469bafae/pierce_college_english_101_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/32483781027.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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 4956 bytes
SHA-256: ec624d843d9e3c3302288eaa25446af5e13d8e9e7ef4f032ee8da9f9d70e6b87
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 10832 bytes
SHA-256: fd2dae17588b21bc3f89de3bb7355480a1bb059c435b46d34b1d1eb352091c1b

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