Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef32f6c060b8e91d…

MALICIOUS

PDF

75.6 KB Created: 2021-03-15 16:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3e70c1b15bd7881ec024dee139447fc9 SHA-1: b72a7e654124d03b035b70c0adbd868cf3a7001d SHA-256: ef32f6c060b8e91d9e1c7ada363b7b01b27371e90b52eaa04724de86ac58cec9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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.
  • 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://jumiwimov.ru/wix?keyword=drop+dead+2.5 PDF link annotation
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/d92daa941cc8.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/iejhZVS/introduction_to_business_analytics_book.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/daxoziranu-vusoxegezabikef.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/dEBbheX/90114130971.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/2nkjdTA/27919339894.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/buzum.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/305d27450ca.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/eed8606f-f9c4-494d-8b91-a87c7d5e1b8a/how_to_analyze_a_video_advertisement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2127631e-78b8-49fa-b786-69985bb1f6db/graphtec_ce6000-60_force_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815e2520-fdc5-4ab7-8871-3c3c03b49d22/88433523952.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_387405dab49748f4beb9a6ca2f9c46e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/522fd4ba-8f1d-4397-9b97-8bb645227dcf/91442672796.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_5b41c710d4164527a2de353098fbcf50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e42669-becb-4bb8-915a-ad9113e966e9/john_deere_gx345_snowblower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92c7927-1cec-4483-a865-22c7dab60734/is_dork_diaries_a_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfda18b-970e-4ca8-8b01-dc1e36452c6e/serawasexowe.pdfIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_4ad888b5273641a5b91296f34220e1e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa2bc6c-cdd8-4bea-8a69-9646883db185/77008526036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f4984d-f550-4de9-807a-ccea4af4439f/sokalojozupijakiwiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca1ceb1-c259-4384-94d2-8c2ac3fdc7e2/povopexojud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96245cd3-225f-4bf4-a611-f339272a672f/supply_chain_management_degree_programs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c69e4d1-e908-4baa-917c-d6a3d637482e/hp_officejet_pro_8600_driver_download_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54dc782-a5f2-4747-ac80-605530163693/m-audio_fast_track_ultra_driver_windows_7_64-bit.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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 5028 bytes
SHA-256: f00c21a1493a20ff9cc1ef52f742e030e749eb64312d770399927c3b8f8fd840
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 11160 bytes
SHA-256: 38b4f747f95949fb10b74c5f9c7d7e85753e00cca412a72dbb04a1250cb4fb46