Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f07ae6a160ea8d…

MALICIOUS

PDF

73.5 KB Created: 2021-06-04 09:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d82c9fe850023085404f3a2eb979c83 SHA-1: 7fde83c06b055c146e8a17b95fa4df4386699ac5 SHA-256: 85f07ae6a160ea8dc7de5ae63323a4bb06beb343866f74bf468ce764d11a7521
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of external links, including a link farm, and a visual download button lure. The document body, though heavily obfuscated, contains text related to 'Vidmate app download', suggesting a lure for software download. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to manipulate search results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/pbw?utm_term=vidmate+app+download+install+new+version+2020+apk+free+download
    • https://dizugupixaxagoj.weebly.com/uploads/1/3/4/4/134440249/7361696.pdf
    • https://static.s123-cdn-static-d.com/uploads/4454965/normal_60afed3644cbd.pdf
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5ff96afdb56f6.pdf
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/lurazu.pdf
    • https://rutukesusejam.weebly.com/uploads/1/3/4/4/134464581/8333408.pdf
    • https://donumidivapog.weebly.com/uploads/1/3/4/7/134734387/f935fdabbc24255.pdf
    • https://lerogufoporix.weebly.com/uploads/1/3/4/8/134885840/de6c62adb6a763.pdf
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/264987.pdf
    • https://xezaresirut.weebly.com/uploads/1/3/4/7/134712286/f8454.pdf
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5fc5a4832925a.pdf
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/bovixekex.pdf
    • https://zibamikalizofu.weebly.com/uploads/1/3/1/4/131409526/ralipipefokitile.pdf
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/6622093e5b5.pdf
    • https://cdn-cms.f-static.net/uploads/4489240/normal_6067942cb0c5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pebenuziwi.pbworks.com/w/file/fetch/144547131/vijunusavupizunuduxekop.pdf
    • https://uploads.strikinglycdn.com/files/46ee098b-62d5-40ee-b096-905b792e65b3/92414276719.pdf
    • https://uploads.strikinglycdn.com/files/0b595553-43c9-464c-a634-e5efb2beff7d/44050692488.pdf
    • https://uploads.strikinglycdn.com/files/c27a8c41-ae27-4fa3-b3f6-01e4e101be19/7751041967.pdf
    • https://uploads.strikinglycdn.com/files/e5885391-3349-4b53-b774-ba4e8907c712/examen_taller_de_redaccion_3_prepa_abierta.pdf
    • https://uploads.strikinglycdn.com/files/549b61e5-8bb8-45e2-803a-585803ec78f1/what_is_the_franchise_fee_for_planet_fitness.pdf
    • http://xuruzinijub.pbworks.com/w/file/fetch/144425556/rativoxenotepax.pdf
    • https://uploads.strikinglycdn.com/files/2756135c-070b-4282-b539-c35a4ce4fdef/mapexolidedato.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144589467/financial_statement_analysis_course.pdf
    • https://uploads.strikinglycdn.com/files/e9b60f93-bd78-4940-983c-dd4e0b493806/vabuzik.pdf
    • https://uploads.strikinglycdn.com/files/92c3a264-bba3-4b19-bbea-1b2a57506ced/betty_azar_basic_english_grammar_4th_edition.pdf
    • http://xoxafepapesu.pbworks.com/f/vilub.pdf
    • http://savavaze.pbworks.com/w/file/fetch/144460341/how_do_you_adjust_the_temperature_on_a_grohe_shower.pdf
    • https://uploads.strikinglycdn.com/files/5b619720-e2f2-4aeb-8b5f-e5919ca9900d/rapuxizox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0eb.bin
1493b325db3b194ef74c5faa4f8307f4872e30ea8978dfeffc29c005cd1ac1b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 5640 bytes
font_01_sfnt_off0000f41d.bin
1885e7b725a7a9aced880d8717ae38c0ad29f7ab78d34e4e6993293a3487c402
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 10356 bytes