Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2027e36939b271…

MALICIOUS

PDF

71.2 KB Created: 2021-03-30 03:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87efb86b02b4aa811b638e55db216760 SHA-1: 1e4e58129da3f5ea700cd201963bc8e7b4d73bce SHA-256: dd2027e36939b271469600cc516fb371ada73811f29b24562718b8f961986561
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect the user to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=fifty+shades+darker+online+india
    • http://xubanapirobula.mypressonline.com/girazatafat.pdf
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/32dcde756.pdf
    • https://cdn-cms.f-static.net/uploads/4380230/normal_604ef12cceb23.pdf
    • http://jafinipu.scienceontheweb.net/gawk_effective_awk_programming.pdf
    • https://fevenegor.weebly.com/uploads/1/3/1/3/131380973/9539362.pdf
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/xaviloseruxadam_lijoxiben_fewazot.pdf
    • https://cdn-cms.f-static.net/uploads/4502245/normal_601e3ff4ad38f.pdf
    • https://cdn-cms.f-static.net/uploads/4413240/normal_601b7b1ead3eb.pdf
    • http://kegetisa.mygamesonline.org/dejusidufefipazapibepaj.pdf
    • https://cdn-cms.f-static.net/uploads/4457318/normal_605f6bd281204.pdf
    • http://komaxinatobofe.medianewsonline.com/27742032916.pdf
    • http://fujigukatujewu.medianewsonline.com/does_delta_sonic_do_inspections.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2e9241af-6138-4df1-9fd7-93159861a853/does_cosrx_acne_patch_work_on_cystic_acne.pdf
    • https://uploads.strikinglycdn.com/files/fbd74a53-232d-4c05-8f56-8e4fe8316fe6/nedujapusovijokon.pdf
    • https://uploads.strikinglycdn.com/files/32d98e6a-6642-437d-8df6-8a15100ecb56/peter_pan_original_book.pdf
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_6c8ce14156cf48099c129fee415ea859.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6f6bbc9-db5b-461e-95a3-f70ddd81463d/a_streetcar_named_desire_sparknotes_quotes.pdf
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_a229e3d90c9e454498c55ca1a4513613.pdf?index=true
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_3dd5d15b106a43ddb1a066d994980a2d.pdf?index=true
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_8834672cc39546bcb9f879b5e27385da.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_471389ac7cfa471186b6821c64ca03e3.pdf?index=true
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_e485666106ba4d3a9f47b0d6bcedd89c.pdf?index=true
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_903a329314cb457ebe93f907a3283dee.pdf?index=true
    • 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_off0000d510.bin
8accbc58c07a14606177c21f7328190dbb3fc2f04a5a338bf271c9f51563817b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 5116 bytes
font_01_sfnt_off0000e681.bin
d0dc3c58ea575df744d26c2ce4774d034b48995aa469b9d5f33c74400fba074a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 12184 bytes

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