Malicious PDF — malware analysis report

Static analysis result for SHA-256 88aa5413b7c3dbb7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-16 03:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 87df99a3d6f2d4b2f2da82e05e0d5323 SHA-1: 737d0dfa6c62d97c3bd2c60acbe7267b55d743a6 SHA-256: 88aa5413b7c3dbb74ecc05fdc366e8e69ca67b180f3a9149072f62a2ce58f1de
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 domains, indicating a link farm designed for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://midufefew.ru/award?keyword=arvind+gupta+science+projects+pdf PDF link annotation
    • https://kigotofu.weebly.com/uploads/1/3/5/3/135323523/5926459.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/bZwjfgh/throne_offline_mod_apk_unlimited_gems_golds_foods.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/xagoxuk.pdfIn PDF document text
    • http://pidikugojan.22web.org/the_first_estate_was_made_up_of_frances_nobility.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/E1Dijie/fikafawa.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/igaAuie/noxazulujuwitoruw.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/iU5zyPC/petroleum_engineering_entry_level_jobs_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/hihcjb3/dr_chesser_little_rock_ar.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/gisovamajuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_93fa66c67a6b41c188a2137e2f43a8da.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_6227c9bcee0642529c69a167b8cfd6b4.pdf?index=trueIn PDF document text
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_002a7f26f5ac4ee5bffc190115da02e5.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_647b62cbb4264fffb432c31fed413f1f.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_d6736003312b4c6c96d4f48a6da3b3d7.pdf?index=trueIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_c7935d6210b249b18ea1702d24b66647.pdf?index=trueIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_a243c960f02643e39cae3e9314324ce1.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_d0341801166647baab700ffda083e6df.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_94934ccea44c42a1aced3961dbb0873f.pdf?index=trueIn PDF document text
    • http://wotonopeg.epizy.com/65623267680.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_3bc344017303483ba083750b16b25e7d.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_6e19a93b3afb41db9e4791f593c374e1.pdf?index=trueIn PDF document text
    • http://zijemuviwovo.rf.gd/alexandria_city_police_reports.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_ace68ec008814adc93ae47f4d6fb09b5.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_5eb5ce4ba8f24e43b90cb56460235ac0.pdf?index=trueIn PDF document text
    • https://0a6609f8-ec05-4c06-9017-86806a0ecaf5.filesusr.com/ugd/a9248e_7c5aa3fa871c43d689666dbe6ceb27f4.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_c1eda9bfa2554a74b283f62957239014.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 5416 bytes
SHA-256: e738469ecef43ca04fd7993c07a168f1a0934640882150c31750397407208f9d
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 12288 bytes
SHA-256: 2035dce92ded4a8d75dc70cc8a9cd76e1d24d5e5ed4ca13e9b0b3bc661a25719

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