Malicious PDF — malware analysis report

Static analysis result for SHA-256 882e977b2e044dd8…

MALICIOUS

PDF

177.3 KB Created: 2021-04-05 02:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7b71efbadbfe9efbfe01f15a7f15dbc0 SHA-1: 8406285f96a87c3da5c5953ec73bafdc7ab2cec9 SHA-256: 882e977b2e044dd8b12614d2795a286091785bd2ac95118b41297eec9e7a504f
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link to dafemum.ru. The ML classifier also assigned a high probability of maliciousness. The document body contains obfuscated text, but the presence of embedded links and the critical heuristic strongly suggest a phishing or redirection attempt to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=bosch+es4+parts In PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5ff77878948e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff696ed649d6.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/participe_prsent_ou_adjectif_verbal.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/AX1gigj/58628461267.pdfIn PDF document text
    • http://esclick.pro/cos180-x-cos_x_proofy6tcc.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/phggfjb/demiwozowekawolujomati.pdfIn PDF document text
    • https://cdn.sqhk.co/lakodatoli/jhrzhej/et_spin_blade_elite_2_7m_30-_80g.pdfIn PDF document text
    • http://item-get.top/xefazivipazud75hl2.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/ripojuzanexofazebezolanix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fff26a8d93ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_6037e34b0f10a.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/idggTaT/ringtones_for_phone_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/merisipugito/igdihbr/sowagavekifapo.pdfIn PDF document text
    • http://mon-cmbretagne.com/hp_designjet_5000596ll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/zeneweluwikezetasofale.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_44cbdcf67be84d3999c76f90bd56867e.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_e0fcbc98de6b464688d83a459db19557.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_57eb7930e6b949d89049540178231984.pdf?index=trueIn PDF document text
    • http://ribikusilotagod.rf.gd/my_book_of_rhyming_words.pdfIn PDF document text
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_329c7717ee7d45898e5591ae1611e1d6.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_c357114999a9405e94adc64377a16ad6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajibile/duxav.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
font_00_sfnt_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 137384 bytes
SHA-256: 85190de11e95d7557e4d52f24fb183f64d861996319e9b1cc159351a70d22d6c
font_01_sfnt_off00026a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A50 5124 bytes
SHA-256: 6f4aa192918674fd3f6b1ddae4de896a72529cab47c2d59b54757b44361e3135
font_02_sfnt_off00027bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BC3 10336 bytes
SHA-256: 99deda0f981554dc1f6bc2381e300f8995697c15ee415f0a7374bbe67f5b7c8c
font_03_sfnt_off00029f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F32 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c

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