Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1350217181f005…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 01:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4c2ade44767e2cafda1a1eb95f42a93d SHA-1: 9425e18024a6e2aa6689f1145b2eaafb26bba235 SHA-256: 4f1350217181f00511afb469082daf9426ba517e5765b042b737b68dbac9fca8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirect to known malicious infrastructure. The primary malicious URL identified is 'https://crophysi.ru/award?keyword=company+profile+sample+format+pdf'. This indicates a phishing or scam attempt designed to lead users to harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://crophysi.ru/award?keyword=company+profile+sample+format+pdf In PDF document text
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/553f1c3e.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/9811590.pdfIn PDF document text
    • https://wejapunikiver.weebly.com/uploads/1/3/4/2/134266614/c173d42ebbc2.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/31805612243.pdfIn PDF document text
    • https://borugurobe.weebly.com/uploads/1/3/4/5/134582704/sibaxatafazada_korut_puzajirogukife.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/ridugijulubimax.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/35bb5fdf-d8d2-4501-86cc-0d515c9918a2/how_to_say_weather_the_storm.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_6718c9bb63094e199b59198f8ea4a003.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvosi/70575215324.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_d1d9e51834d54e0e9c69f48d1df84cc5.pdf?index=trueIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_e82b8930e2224c1bbde2fb30d03c5518.pdf?index=trueIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/adobe_premiere_rush_free_transitions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e351d2-ea27-4ff1-a79f-59e8253dc5a4/22851467441.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_3d593104e6854f73b50f1f73192eafe3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9db1a53-3596-4e30-9360-4171df4cc055/lifilajaredupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708c28af-e840-4cd4-ae51-f66872c0170e/stata_ado_file.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_7913e17a7ae248f48df28a443d6923b2.pdf?index=trueIn PDF document text
    • http://zakefuki.myartsonline.com/doxed.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/divupimisubisozederitepo.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/synonyms_vocabulary_for_ielts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f335a92b-a12e-4a3d-8d02-a7912be838ee/global_warming_map_skills_worksheet_answer_key.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_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 5196 bytes
SHA-256: 3f9182e8b8c5ca2250e31678da3e1b5cef129d4cb8cfaa31eb2609e2fa43b7fa
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 10988 bytes
SHA-256: 4a4e470a1f878efec499479eba2d1c724e74717a09b2f9ba65497bac7814fb19

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