Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a986cf5cab443f9…

MALICIOUS

PDF

163.0 KB Created: 2021-04-07 23:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b827ebbb7b2b48fb02e3bae183d047c9 SHA-1: 9fdbe59d724c7f7aa5b57f753009b3b884c48b58 SHA-256: 1a986cf5cab443f96903ce85916e7c9fd9f0d49e4c43a74ce7dd56bd9ba61bbb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm designed for SEO manipulation and potentially malicious redirection. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily truncated, suggests a lure related to product manuals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=gear+circle+bluetooth+headphones+manual PDF link annotation
    • https://cdn.sqhk.co/kafufojugure/fjeO7j8/pidera.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/mafuxusadoka-xurilifurene.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/g5biW0H/vande_mataram_song_free_320kbps.pdfIn PDF document text
    • https://kanoritixuvu.weebly.com/uploads/1/3/4/8/134874131/tatolimuj.pdfIn PDF document text
    • http://soxetav.iblogger.org/62649290399.pdfIn PDF document text
    • https://rowaxomizubo.weebly.com/uploads/1/3/2/3/132302787/8435a02f6e39bb7.pdfIn PDF document text
    • http://tatawimaxumozun.iblogger.org/58742019401.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/38814568594.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/16732931994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_5a43636c7f0d492eb50579ffaa932bc2.pdf?index=trueIn PDF document text
    • http://tipesajiwe.epizy.com/frutas_y_verduras_de_temporada_espaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2147ea6b-07df-4be0-9ac8-cfa96567f360/how_to_calculate_punching_shear_in_slab.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_e4b82750090044f98ad1f307a9976024.pdf?index=trueIn PDF document text
    • http://nuxibuzejapise.epizy.com/8093977714.pdfIn PDF document text
    • http://vezonufibil.epizy.com/cemal_kak_cinayetinin_karanlk_srlar.pdfIn PDF document text
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_9c9c5b057ba74af3bfa6214582b42477.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_054458321cba4131aae9170cbc7a598e.pdf?index=trueIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_31014267f3064928a01947ae3190e98b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c496978f-a6c6-4a6e-b12e-5e6e2f647f1e/how_to_explain_present_simple_and_continuous.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f907.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF907 105408 bytes
SHA-256: c45ec9ee2c8d8c80119cdd1f8680c9055b1ef5ca2884e6e5e2d16463bb87c72d
font_01_sfnt_off00022d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D2B 5484 bytes
SHA-256: d6baa581e084c253344b3300d2e45528a6f9309d7aadc6232afbf19a80b98655
font_02_sfnt_off00023f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F9D 11340 bytes
SHA-256: 8e251d6de1309250c01186f79b5c08f44dd17ed529626572a4d06d3e0b8ebc1a
font_03_sfnt_off000266d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266D3 16128 bytes
SHA-256: b3e72b4a6b7cf1c4375d20d0349155a325caa38f6cb7b7b426bb1dad647af250