Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa2dbcfcd2ec94e…

MALICIOUS

PDF

85.9 KB Created: 2021-04-24 17:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae25006ceaec391bf4e53b4ad6f4dd4a SHA-1: d4ad1f6c5dea5c4444b95c465cda2c1d96cd2ece SHA-256: 5aa2dbcfcd2ec94ebe3c5200e2b392bcb31799118c6157440398a24d97a7d09c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://leonvi.ru/strik?utm_term=how+to+read+body+language+book PDF link annotation
    • https://sowosevutab.weebly.com/uploads/1/3/4/3/134311467/mepofifesebat.pdfIn PDF document text
    • http://xabudumame.mypressonline.com/microplastic_pollutants_crawford.pdfIn PDF document text
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/3c6a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_6019d217e2fad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_600c8c858e880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_6011c4f81456e.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/8ed5615bbda48d.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/9c53c44b.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/ponenosusanekamaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_601040d60ac9d.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://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_531b034e3e244ec09f1ca626bfb4b836.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/rcbs_chargemaster_lite_vs_hornady_auto_charge_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337e46ea-aa06-4955-91ff-da80bb081da1/how_to_find_mean_from_a_grouped_frequency_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f75d03c-d517-47b4-bd80-e1ae4ef9af50/zepojumulojizotanetolerat.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/garmin_nuvi_2597_price.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/moto_g6_plus_price_in_pakistan_olx.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/pagevujav.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/gedidege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a56ea3b-cf36-4d74-8d9d-cab5a2cae11d/final_fantasy_x_strategy_guide.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_2315bbcf956b401a85cb9926931faa45.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_462aaf98db7c4dc59e10816e31dbfae1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2bf322-51b0-45f8-a6f9-3dca74694f91/how_to_increase_brightness_in_casio_calculator_fx-991ms.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_27c19fec0c2d4d5c9d065db35b84a398.pdf?index=trueIn PDF document text
    • http://zugagib.atwebpages.com/questionnaire_on_working_capital_management.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/boca_do_inferno_ana_miranda.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_37d587a1f69242baa7cf34e6a67b0e63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc66fbf1-a636-452c-9bee-e3a643a55b4f/xeravowitev.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_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 5008 bytes
SHA-256: b3cbc112d98ee4c426dd4580404e0cd2ce8b2d1fd92f28346d2136591f2c8ef1
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 11524 bytes
SHA-256: 595d9acd7ee72f7df10f82ade9c91b9884dfec580fb027615efdff941de8421c
font_02_sfnt_off000139d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176