Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a3a158e13d3012…

MALICIOUS

PDF

83.6 KB Created: 2021-04-14 00:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2930a204e82b31f0155d6131194f9d5f SHA-1: b1cc9b0b7d78db6c73fc79d4b15c397b98fa0d3b SHA-256: 62a3a158e13d30121360a85f0123f8603ff69c5a6571852db338924425ec739e
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 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=rabaey+digital+integrated+circuits+slides PDF link annotation
    • https://cdn.sqhk.co/gekakisoduvo/gipwiiz/renaissance_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/SFrjhif/kodoketujidofojubukax.pdfIn PDF document text
    • https://cdn.sqhk.co/kopubeno/4jeprhc/lep_s_world_3_level_11-_13.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/ijihomZ/goodgame_empire_similar_games.pdfIn PDF document text
    • https://nizawubanivud.weebly.com/uploads/1/3/4/5/134529200/netekusad-pagerupe-tuzefot.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/cadastre_maroc.pdfIn PDF document text
    • https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/besuxutariseb-ririzevoda-kapasotoz-mijikebeteneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_604187d6ecf44.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/ijVigji/93409134137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_6031dd6fb8ef9.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/gekolovifowimub-saguxij-kiwane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_601ee44c66bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_605060acdc5f7.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/8339128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ebe1e6a-8a13-4145-b3c2-d2faed65f423.filesusr.com/ugd/a67e73_f24826029f72494a95eb6d2ffb26addf.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_9aed09bef4314f6d861cde31442df5e0.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_27909630a42a4c6790c878f50aaee7c0.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_b7c278d48b544c938735400d9a8ebafd.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_0a27604e13114d59979742fa54b2ce88.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_8e567279d62145b9bb9cae1fedfc327d.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_1225f5d9eec040f2b74270d8084d3934.pdf?index=trueIn PDF document text
    • http://fidikaxano.myartsonline.com/nigonabixatijix.pdfIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_640876e8bedb4874b1d7781349a2a3a4.pdf?index=trueIn PDF document text
    • http://zujakogi.onlinewebshop.net/puxemosunovosobumilog.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_e6e7db51dfd640eba8f51a24bd74fac9.pdf?index=trueIn PDF document text
    • http://vajapojaperusu.myartsonline.com/76292418618.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/perimeter_of_different_shapes_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 5356 bytes
SHA-256: c0bd76e2b8fffb82dc55773a18a03de5a066215add619fb896f5ecf1caf9543b
font_01_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 11252 bytes
SHA-256: fbaa337460110ceb58cf0a192d0beea518abc60bb103fcb335c63810d04e1666