Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76438075d3faac9…

MALICIOUS

PDF

73.9 KB Created: 2021-06-10 19:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e74c38275cf7618ef76193a5f2f583d5 SHA-1: 04f0a0176695be2f3ea643b99f3047705861d7fe SHA-256: c76438075d3faac9fad927321c37943d0243b3c7307b427adc802dab9a59c1b7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://medvor.ru/pbw?utm_term=free+model+yacht+plans+pdf`. The presence of a link farm suggests an attempt to drive traffic to potentially malicious sites or to engage in SEO manipulation for phishing purposes. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/pbw?utm_term=free+model+yacht+plans+pdf PDF link annotation
    • https://rofetavagamufup.weebly.com/uploads/1/3/4/3/134373504/buraxiruti-noluze-tagukibaloko-runogewojum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fef40855009a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_604175a2de9a5.pdfIn PDF document text
    • https://mugibamarenov.weebly.com/uploads/1/3/4/1/134109107/3586644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_6059c00bc42b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fdbfa122629f.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/0f35b641-b323-4db6-80a9-529274cca165/29451147250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023fa43c-0821-4dc3-bd99-3a6abc53cbf8/8983980338.pdfIn PDF document text
    • http://serizedez.pbworks.com/w/file/fetch/144628923/lego_8097_instructions.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144695928/how_to_write_a_conclusion_sentence_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8da411-04c7-4e52-b362-d69ea28c9664/programme_maths_prepa_hec.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/29392806179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3448ca1d-64b6-4fe3-85c6-2eae991c7b32/do_steroid_injections_for_tennis_elbow_hurt.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144843156/coreldraw_x5_free_download_full_version_with_crack_64_bit.pdfIn PDF document text
    • http://tulusozofel.pbworks.com/f/xojezazutumet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a505972-9893-4f35-ba88-4537dc49dd5b/nevazikofegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e7dc02-a4dd-4b3d-8d2a-b8a19251f960/the_most_unusual_hobbies_or_sports_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f9bf14-0976-4ee1-9ebe-a8fff114bae0/from_the_mixed_up_files_of_mrs_basil_e_frankweiler_movie_streaming.pdfIn PDF document text
    • http://bajupuko.pbworks.com/w/file/fetch/144932628/download_video_star_for_android_free.pdfIn PDF document text
    • http://bazibenis.pbworks.com/w/file/fetch/144951828/jolobibumivawuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93085b3d-57d9-4331-a449-6c64576f3772/52519544087.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/my_dog_has_brown_patches_on_his_skin.pdfIn PDF document text
    • http://zedilowozare.pbworks.com/w/file/fetch/144861273/1500145741.pdfIn PDF document text
    • http://lavijusana.pbworks.com/f/polarr_download_apk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371a0110-6052-45e8-ad67-dce040a4845a/do_it_yourself_painting_with_a_twist.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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 5452 bytes
SHA-256: f436223044085f37be8dc9ee7499fe7732b77c69963fe4ce8246ba7b909d5332
font_01_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10620 bytes
SHA-256: 0a99888ecab7118a2ed0fd6fef18df4abe92bf113ab296fa06a569d1a8298971

Open this report in the interactive analyzer, or submit your own file for analysis.