Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8f034fcad4f31e…

MALICIOUS

PDF

88.3 KB Created: 2021-03-18 20:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 01ba8b4c741725acd82e0d6f4821345f SHA-1: d4b0bb70abe83cf4615c9595a15364fe99761b6e SHA-256: eb8f034fcad4f31e4e9bf55ed891f4a770aad7b166a896e80cc3f7fc6f4258c6
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of ClamAV detection and ML classification as malicious, along with the 'Password-protected archive handoff' heuristic, suggests this PDF is part of a phishing or malware distribution chain. While no scripts were directly extracted, the PDF structure and heuristics point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fokemale.ru/award?keyword=seguran%25C3%25A7a+e+auditoria+em+sistemas+de+informa%25C3%25A7%25C3%25A3o+pdf PDF link annotation
    • http://pofaduxiruk.getenjoyment.net/ascii_code_table.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/98707170796.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/gjJJghj/59515910954.pdfIn PDF document text
    • http://zavulibalox.mypressonline.com/vofavezodurule.pdfIn PDF document text
    • https://cdn.sqhk.co/derixosu/bZVjhHs/cartoon_slip_sound_effect_mp3.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/piladevisusiwepolojaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kazakilen/Pibhajh/gun_range_dallas_oregon.pdfIn 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://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_e4af8200f9ba404c910531317e294c2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/942182f4-fbcf-44f2-8a2c-38ebffdca08a/how_to_update_nook_hd_plus.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_3072453c3279488eb5db7b5128974c8d.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_11bd35049d9542c1b8538d1b27966efb.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_7cfb0186ce874c4980da1497039b26cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86e48b0-8049-4960-8b68-82e6eb5f96af/integration_of_logsecxtanxdx.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_866793f2439145268b855cf247068eaf.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_147872df6200489dbb3f759d38860541.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3646a830-01b7-4353-a12c-fb438c0096fd/rain_dial_fus_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625c477b-0f85-4d83-8558-ae23e88e3297/45249422944.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_667d4077792d488e995c25f9bfdc85d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c409aae1-9987-4533-82dc-ad137a541920/strongs_concordance_and_bible_dictionary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 5812 bytes
SHA-256: 83f7c831c5d4d1ef85a0dae020bc7bd8b1fe9594b455d519590005fac36e98c0
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 13620 bytes
SHA-256: b6c694c57fc2631673ca10bbe2ee4277da88dd17ef9254646403927ea0641233
font_02_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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