Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ce7dbb1a2f1836…

MALICIOUS

PDF

81.6 KB Created: 2021-03-29 00:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 28276796068e7e4303090d121823d84c SHA-1: da7e1611b5972c7c9d2c77d5d13f9e8857694eed SHA-256: e4ce7dbb1a2f183695e6f1a3dbc46862f1a8f84bfc76e5071d053ac777902c0d
244 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and redirectors, indicating a link farm for SEO manipulation or phishing. The presence of a known malicious redirector URL and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dremel+7700+cordless+review In PDF document text
    • http://meinekarten.best/80878223511p5q97.pdfIn PDF document text
    • http://soldatskaya6.ru/979077602847kg2y.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/nhhKQee/pofekegezedavil.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/cibcihX/wajopajetijasur.pdfIn PDF document text
    • http://clientbluebadge.com/free_wood_carving_books4rt8c.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_60287d4a59234.pdfIn PDF document text
    • http://titanovyi-filtr.ru/ibanez_gsr200_manualgxcrv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_6048ffaf00b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_6058cb3d64029.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/c09f2fca-264b-424c-894d-dc37465dd67c/43945545263.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_ad234b69de6d485a9f19f9723951c6a6.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_6515c6c35cad4927ae8f44d935c76c13.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_65315828749d4b9d84ac55ef9fcd4ea4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aca4ed7-08bf-4a31-8941-4bc19edaccb9/zadamisabojis.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_e7f31ee63bb64f8ea2adcfb09294bb0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1bbf20-5026-477c-aff1-963797b9a621/what_does_definite_chemical_composition_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9b6f5c-013b-472b-a820-9450daf3ce61/vubixaxoluxasonetux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4f3a64-023d-4464-9839-fb038f6903c5/where_to_watch_the_hobbit_trilogy_for_free.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_e4cb95ec82e34efb80dce54f4800b766.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad45e7d6-f261-4452-a25a-6c14b6fe8146/96371683840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230ee823-e705-41a2-8e02-c128cf9fd998/75817986196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cac07c-5e00-4e35-ba8d-892bba08572d/sarulajanawadetuwafalip.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_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 5248 bytes
SHA-256: b6442b37ec5334b0d92733be62a13208d028fd752b3bfe8f9b35e453025df364
font_01_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 11424 bytes
SHA-256: 0bc86a62368b16a6942c08a293de935a76716f85c69fb12c9d78693ef21bf719