Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17b3d74fa5c5d05…

MALICIOUS

PDF

87.7 KB Created: 2021-05-10 21:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d721cddd6dfe7b4be6c90739c0a3213d SHA-1: a587d622a9ca65223ef72de9533b3b8c69f2ff6a SHA-256: b17b3d74fa5c5d05d56f71aabf7b1e6919a39093246ece3b71601bbff9ca82d5
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 hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=stoeger+m3500+parts+canada PDF link annotation
    • https://cdn.sqhk.co/fogobewataja/CJebgj0/shooter_lube_negative_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/hHnuwq6/revogudosomumezexilotenif.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/7bOISVO/puborov.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/OKhdic2/x_plane_10_mobile_flight_simulator_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/0jbJgia/bellator_mma_vs_ufc_cual_es_mejor.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/NFw1mia/candy_crush_soda_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/jhhaOZU/eddie_hazel_game_dames_and_guitar_thangs_blogspot.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/hsichfo/hashtag_project_management.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xisefowu/88648801956.pdfIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_8a69583235a44d508a9f95044dc10e13.pdf?index=trueIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_749c26450fe34c4eb8e142bce007066b.pdf?index=trueIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_683c51c3c6f74d39a208fffb2e4c0165.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_0d63f8ff560a40618110aeccf0371867.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_c4d9d9be6a0447a5a01822d45768a8dc.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_e872a959763f48e1aeb41b040e6e502f.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_02471575228649e489cef2ef174be539.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/gimp_2.10_10_tutorial_franais.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_b12937e3c3f84951aace03d4f9a5906f.pdf?index=trueIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_63ec224bf34b4cce823c21cc11b30cce.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_475460a3231e4737b85bd70815c2a308.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_113c1c4cd71e4efe9b83600d307681fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/love_status_video_mp4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 5892 bytes
SHA-256: 8cbaaeced94b28a13633944cee9844df4b281c2f2a9480b6e64fbed4864281a2
font_01_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 12272 bytes
SHA-256: b5f13c0eda370954b8f09c36d68861bec03829f0d95c015e2411b936f1dfe47d
font_02_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 16180 bytes
SHA-256: 24f18d28bc599d08c080d6abcdbad549237be7a96a675e4d55206636f0820ad5