Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ea0920dd41139b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-27 23:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed43b23ebc7d675537446d4661fb09ab SHA-1: 2273f182453cb00426ff730b130527f70d0904d9 SHA-256: b0ea0920dd41139b1f4bfc8e0685e155c83f7818fe5ae06e6bbcae4a7dce7374
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content or phishing sites. The primary malicious URL identified is https://nipisod.ru/123?utm_term=engenharia+civil+calculo+estrutural+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=engenharia+civil+calculo+estrutural+pdf
    • http://nejupike.mygamesonline.org/what_is_the_best_basic_cookbook.pdf
    • http://nizavevorupuj.mywebcommunity.org/828675115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2d6e68e5-299f-4727-ba6e-da95e1d504fd/cmos_digital_integrated_circuits_kang_ppt.pdf
    • http://vawofirulev.myartsonline.com/15011076958.pdf
    • https://s3.amazonaws.com/zakunafu/jidisod.pdf
    • https://uploads.strikinglycdn.com/files/c69e4219-c083-426f-b511-baf6f91f8e83/97004288974.pdf
    • https://uploads.strikinglycdn.com/files/eec9d3e0-8535-43d3-b60f-66badb1e740c/how_to_pair_mini_keyboard_to_fire_stick.pdf
    • https://uploads.strikinglycdn.com/files/298b11a3-8bfa-4d59-8a7e-1958336f73e1/explicar_el_concepto_de_tabla_peridica_de_los_elementos.pdf
    • https://s3.amazonaws.com/bokelur/57937092757.pdf
    • https://uploads.strikinglycdn.com/files/56e1cd03-3a1d-4f12-9d11-8accc10cef92/similarities_and_differences_between_impressionism_and_expressionism.pdf
    • https://s3.amazonaws.com/mogipegi/battletech_heavy_metal_wikipedia.pdf
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_84c940eb60e4479680acb76b5c655409.pdf?index=true
    • https://9d0a8b69-4790-495c-a4d5-ed29f3eef23c.filesusr.com/ugd/4cd51e_2187748c23d14db69619022bd7351456.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93881007-8116-441c-a6bb-4011262ac024/dunkin_donuts_latte_sugar_content.pdf
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_4bf5f9fcc04e4bad83abac6d76490460.pdf?index=true
    • http://positajugopisu.myartsonline.com/52875984065.pdf
    • https://uploads.strikinglycdn.com/files/fc3fb15d-e4f5-4c2a-aff2-c9b2598f0bf2/what_airlines_dont_charge_cancellation_fees.pdf
    • https://s3.amazonaws.com/siwixomudit/vezifaguxemelisisufiz.pdf
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_1fff0400525d4273a8863af69f47aaa5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/20d25c4d-67ae-4743-9dc2-3e75d7d8bc25/gemilejavotufosobag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d9.bin
8a00f13ecae258d2fa2ae8dcca6d1f0a6731c2df73b27d4d3fb9912bb9eb4d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 5316 bytes
font_01_sfnt_off0000f4e9.bin
8f5158efc44a29a17ce10579e4a8ed0dff85108e494bdafd4b946e802e849969		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 12728 bytes
font_02_sfnt_off00011cdd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 4324 bytes

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