Malicious PDF — malware analysis report

Static analysis result for SHA-256 5962da7ea22ede46…

MALICIOUS

PDF

76.6 KB Created: 2021-03-24 00:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cf76fa45231330ec395fba1610b14b84 SHA-1: 550fced43cc655791e7877333bec359d70ad8ef8 SHA-256: 5962da7ea22ede4698ed238c394cc64fa302a2f52f70acc4b1811dcb73cc9f9c
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external URLs disguised as a textbook. The primary heuristic firings indicate a large number of external links, many hosted on disposable domains, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=en+espanol+2+textbook+pdf PDF link annotation
    • https://cdn.sqhk.co/teposodigar/w9gdBhg/car_dealership_tycoon_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_6053dee713bf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_6013bdcbde12a.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/sk8mcje/world_market_coupon_in_store_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382953/normal_6000a740713e5.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/gejegdf/kodiak_bear_bites_cinnamon.pdfIn PDF document text
    • http://my.hrw.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5aa3379b-a20f-49e6-87d5-96100c4b42c3/18866260752.pdfIn PDF document text
    • http://wobazopaf.epizy.com/alfresco_multiple_files.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b002edf-14f2-4b71-9dd4-a24f820c57ff/10653711832.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_5ca70c7db6104ee39f36661e5a576932.pdf?index=trueIn PDF document text
    • http://dimegebewode.epizy.com/53002370472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a3984b-0881-45ed-95f2-810661d6d108/99728430804.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_984987fbdb334ad9914b37d11ba77f50.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_b0cc2d2707cd4823ac92b210ad9f08e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b4024b-9097-413c-ac97-1a8ebeb44675/polaris_sportsman_500_service_manual_free_download.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_bb0e164cd39d4e2d8a6d3778ac8a0afa.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_23023ab922944a55ac2a29230a0a0e55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a460af-07da-4bf5-95c6-dd7169d607b2/how_to_access_my_cloud_ex2_ultra_from_internet.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_f47ad2814fc54b8a823f2a578a1294ca.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_48813331654740db8a6a76849f195a82.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_84f90e11d15747ada3688710701547b5.pdf?index=trueIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_63da8a1542734b74a582b66a5c449f53.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5040 bytes
SHA-256: c8f5d0e9b2f78894d3dc803963dbd547f4b86acd869a4e922c5817624fede04c
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 11932 bytes
SHA-256: bd21957e41ebbdf3817cee3330ee254b501093761b3f2ee9ec0ca70e7bc57a09
font_02_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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