Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e5866df546df02…

MALICIOUS

PDF

74.2 KB Created: 2021-04-05 21:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1401b5735196b32d41eb222e26397dc6 SHA-1: b1d7f48f6cddef5758ab2e7404ada31c2197f1ff SHA-256: c0e5866df546df0299b0f8bd48924eb18483144c756d7840b3a6723bf27dde27
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 0.9991

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/wix?keyword=mc+magic+lyrics PDF link annotation
    • https://lirigudufov.weebly.com/uploads/1/3/0/7/130776684/b9802d1bf397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_60017752a6a70.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/pibisasamuwavedawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_604a956abcd65.pdfIn PDF document text
    • http://topcreditcheck.info/irobot_braava_m6_robot_mop_reviewsjf5sv.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/xuxejavetut.pdfIn PDF document text
    • http://slimitalia.space/3464741510026yc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388063/normal_5febbe493770b.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/puxel.pdfIn PDF document text
    • http://raftgjgr.space/national_geographic_kids_magazinepcv9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60320363271d4.pdfIn PDF document text
    • https://gumijaxedug.weebly.com/uploads/1/3/4/5/134529094/vabexoza_kopavavof_nofuxepuwe_tusinevawuw.pdfIn PDF document text
    • http://formverifiedbadge.com/american_big_picture_a1hhv06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xomepixo/quem__o_primeiro_ministro_da_inglaterra.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_1a94caf9928140daab6d99764077343e.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_7501cdedb25847368ae83e6991785ff3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/3786414816.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/roreroti.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/23321625066.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_363cda724b0c4ce6b36102864a0200ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/which_is_the_best_dewalt_table_saw.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/ninurisazifewifuluw.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_eedeeab9cc0744ccab2b151ae7b61050.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_ba6f2e51e9124707b1c281654f9a037d.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5228 bytes
SHA-256: b320ceadfd7acae733444f64e4b892c0881230858c8f04504576931674f9415c
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 11132 bytes
SHA-256: de5594c3044155783222ae569b3c2f5b7a61560cfe257a2dd5295e2163f60b3b