Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d051b0a7054c9dc…

MALICIOUS

PDF

84.0 KB Created: 2021-04-10 22:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 03bb3815c61329a5590f1e5ff1352ed8 SHA-1: 271a57361a25dab9eff24cabe47d40d60a2ee268 SHA-256: 6d051b0a7054c9dc2eada3ed2913ea47b674723cd0c73d882f8404c33c087887
126 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 services, indicating a link farm or SEO manipulation tactic. The primary external URL, 'https://ponafet.ru/strik?utm_term=ncert+solutions+class+10+physics+chapter+12+electricity', suggests a lure related to educational content to drive traffic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs are indicative of malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=ncert+solutions+class+10+physics+chapter+12+electricity PDF link annotation
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/7Ojc9CR/memorial_service_for_kobe_and_gigi.pdfIn PDF document text
    • https://tekopazaxalar.weebly.com/uploads/1/3/4/3/134348639/4445363.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/XjdQhhq/blackened_catfish_recipes_baked.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/d81e0a10267bbd1.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/ziephbY/33281995196.pdfIn PDF document text
    • https://tilesutetogetu.weebly.com/uploads/1/3/4/0/134042518/8881327.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/e22f591f-f85d-41d3-b5ea-d027ca18f9ac/sidug.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_4ad012d9883947029cafa41dd360b5e3.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_f7ce920173e34309854db9c9d4ca2d05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falufusu/tigojivujovora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9308d5-e8c3-4245-8948-45d2ec8d1991/el_hijo_horacio_quiroga_resumen_yahoo.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/is_amazon_rainforest_still_burning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12604b0e-2476-440b-ac73-8e1823e48a50/how_to_make_money_buying_and_selling_houses_in_bitlife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c0835d-1f98-4615-be89-7259ea0139bb/58464825413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a3fa65-a1d9-4602-befb-4e113257412b/what_does_audacity_mean_in_farsi.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/good_food_guide_2019_hunter_valley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7465ff-9d2e-414b-831a-2aa7eca3f30e/desuzilopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2096d8-92dd-40c4-ab59-2205452f03b4/81348333151.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 5416 bytes
SHA-256: 93bc3670880649bedcccc1299bce7e99a94f231a1c29f05ae8a889d336be3835
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 11204 bytes
SHA-256: 55df081a2b002d5f3618b5db8ed722a6bd4f74ba55594f5e2b463469f6f53954
font_02_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 16460 bytes
SHA-256: fece87ec96b87fb8f13cf543e4d52688b869a1fa809ddd6c5dd80a908a001cc1