Malicious PDF — malware analysis report

Static analysis result for SHA-256 e199ff5f348403b0…

MALICIOUS

PDF

82.7 KB Created: 2021-03-18 11:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c139bc389d0762fa8f980c91c0594f1c SHA-1: bc5ded173ee9f0064fbf99abc0e6eeb911259835 SHA-256: e199ff5f348403b04da18b80d20e58b22dfbc2d4b3475580a172588c4d836fb3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as educational content, such as 'physics 10th class textbook pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=physics+10th+class+textbook+pdf
    • http://lulopoboxefon.scienceontheweb.net/nigerian_navy_training_camp_pictures.pdf
    • http://eslife.pro/what_do_vegetarians_eat_for_christmas_dinner0g94n.pdf
    • http://eliyalte.com/free_printable_alphabet_worksheetswj068.pdf
    • http://gelufose.scienceontheweb.net/albert_einstein_life_story_in_kannada.pdf
    • http://rosipale.scienceontheweb.net/78492520573.pdf
    • http://wiinorama.space/was_andrew_carnegie_a_hero_dbq6vyg0.pdf
    • http://novonet.online/23787899901th0x9.pdf
    • http://item-get.top/78064472700yggfb.pdf
    • http://omynutural.space/absolver_move_locationsnyjvl.pdf
    • http://baby-slings.ru/33164897801tka48.pdf
    • http://shop-kid-toys.online/battle_royale_games_no_free0i13c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_0af740615663449aa058f39e13044e02.pdf?index=true
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_552ead5de91145e5bef40cee1f712f97.pdf?index=true
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_4d56be0e9cbb4a319b593e7f7f8ed295.pdf?index=true
    • http://liroporuki.myartsonline.com/75957374559.pdf
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_06bffb92ab4c4129a88f7a1979865470.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_45200ad007954ff3bd4c067f30302333.pdf?index=true
    • http://zijiwaras.onlinewebshop.net/dark_souls_2_faith_weapons.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_4917cf5161a641a489ba291baf52b61f.pdf?index=true
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_d5cd29a798924001ae4342452f0d57de.pdf?index=true
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_1dcda382b03f4d06813d6c4b5e452d2a.pdf?index=true
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_bcc657a819a94e52bccb9e060c41ee51.pdf?index=true
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_386d677303ee44a9b8bc177ef2c4f585.pdf?index=true
    • 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_off0000eb27.bin
d5eb7905f40163be751b0b44f89c7dd83388f11df31da799d33d9e1085f0e312		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 5716 bytes
font_01_sfnt_off0000fea7.bin
ef3c79827be705b14c04a05c7cb0b86a45136db6c836882ead53051d22b4bfdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 8760 bytes
font_02_sfnt_off00011848.bin
544a123322efeb1076bd7f9bdd9a41971edcfb548035f9523381b3f24e66022e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 10640 bytes

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