Malicious PDF — malware analysis report

Static analysis result for SHA-256 e481ffea7d52b9b4…

MALICIOUS

PDF

82.2 KB Created: 2021-04-17 14:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 898abc6dc61c33ea3ac80ce76a86e6a1 SHA-1: e4e08f2b92ebfa12b72e131d8aaa9d4844da1c55 SHA-256: e481ffea7d52b9b40b8bb1a2db89046329cdf3f5a5be570e8a8551acbb64185f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://druttle.ru/strik?utm_term=romeo+and+juliet+act+1+scene+5+worksheet+answers
    • http://daliadiago.com/way_of_the_elements_monkf2ia2.pdf
    • http://trickyturkey.com/the_first_stage_of_the_french_revolution_was_marked_by_thehmzy4.pdf
    • http://usacarins.com/jorefii51zv.pdf
    • http://presentinsta.site/rig_veda_sandhyavandanam_in_kannadavui2l.pdf
    • http://dk-inc.xyz/28417185760chtp9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97857a5d-e1e9-4c28-b791-0ffb7ecba15c/psychology_9th_edition_david_g._myers.pdf.pdf
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_cec47c067d764c9583118e2f0b050727.pdf?index=true
    • http://xefujifivifizu.epizy.com/29217038613.pdf
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_c0e95380869e4a6895afe2df3cb9c6de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8b5c60f-01b6-4616-9f9d-d4bae36e6ea9/nutrition_info_for_taco_bell_crunchwrap_supreme.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/article_50_full_movie.pdf
    • https://70a023e4-b173-4b34-8ac5-854d526a16b0.filesusr.com/ugd/5aec30_9b78912c06a74a8b859fbe31ccbfdc28.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d92597bedd124a49aff9099e4851c155.pdf?index=true
    • https://s3.amazonaws.com/zerepuzuze/bomimunute.pdf
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_51354d220c8a496e8cb4e282f366a59e.pdf?index=true
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_510e56d46da44488bfcc396fdb38fa98.pdf?index=true
    • https://s3.amazonaws.com/lezopobigeza/50901956091.pdf
    • http://rukanaka.epizy.com/amar_bangla_boi_class_1_download.pdf
    • https://uploads.strikinglycdn.com/files/7a12c914-2993-4b44-9672-3c27467379ba/iso_22000_fssc_22000_standards.pdf
    • https://uploads.strikinglycdn.com/files/185d281e-a9c7-4180-bcc8-aa2fa57f81a8/fibevozujuxara.pdf
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_0b606caa1b9d431da849fff9d853244d.pdf?index=true
    • https://s3.amazonaws.com/ximupuv/62692404917.pdf
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_67638e9c74aa408f920829bcc52d1a2b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/73629e27-38d8-4da6-8f92-c53621456b00/ximufazupelib.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_off0001004f.bin
0b8401d412627aa74a798b752aab5f11f3dd64903b59ad6c6c28da5b781502ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 5592 bytes
font_01_sfnt_off00011349.bin
3745a6e6b26c62e89d1e3e48f295917fbaa586385af93aa27564b0540173b4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 11752 bytes

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