Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc4c3566f82b8c2…

MALICIOUS

PDF

85.2 KB Created: 2021-05-05 10:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a9def032b72b2d4adf4fda22c712e7a6 SHA-1: 6db21bd949ccff95cf8c17105a365633cb065281 SHA-256: 1cc4c3566f82b8c22e150274297f91f41bd76ed54d93d8e1e181795dc30f12da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, 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 link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=frigidaire+dehumidifier+70+pint+reviews PDF link annotation
    • https://cdn.sqhk.co/povuguzuloga/iahbhai/lagu_tanah_airku_versi_alffy_rev.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/jvthipI/xivumokavezego.pdfIn PDF document text
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/9905aabb88cfba.pdfIn PDF document text
    • https://cdn.sqhk.co/pipezifiwip/M0iSiaM/92610623330.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/Lhg8Qjh/blockchain_definition_supply_chain.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/bhcqyjg/84697338598.pdfIn PDF document text
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/a08152.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/Tejijhg/brad_s_deals_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/KUtjccp/cartoon_network_art_style.pdfIn PDF document text
    • https://cdn.sqhk.co/sexifirume/hcjeYnG/cnc_turning_programming_manual.pdfIn PDF document text
    • http://50off.pro/180164689581a467.pdfIn PDF document text
    • http://winsl.space/95414409044p6xst.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lutaretubonen.rf.gd/galore.pdfIn PDF document text
    • http://zulifozomitolos.rf.gd/buying_a_used_car_victoria_covid.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_c5b4661d3c914f91bbd46fc2a4aa0bc1.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_4e8dbce1795f4d608ee9559a1ef75318.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_92a8b8e0c91a440c85f12e9292d8342a.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_b95d85102d6340c9aa686a9afc30a2e1.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012cc6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CC6 17684 bytes
SHA-256: 34becaf46fe432fb502b765fdd18d6a477163594d91b87d0aa00a0196c88a786
font_00_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5752 bytes
SHA-256: 95f707514ab11f48aee2046e6f6dc9eb79e6fc1667168451fa4dd547a61a8b9a
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 11128 bytes
SHA-256: 7933f764ed96be55d643df9f3b1fd9f72a820763d1f85a4c187ce52e3cf7c58c

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