Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca1448b83a1aede…

MALICIOUS

PDF

79.0 KB Created: 2021-04-13 05:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5e81b75116c6304cf30e899cd245d0e6 SHA-1: b2f1de67b47c85d41f298a1bc2f2e5475ac9165b SHA-256: 4ca1448b83a1aede938b749e4cdb0c7d6a2066889f7fd0b904cfd413e384dffd
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=grammar+english+exercises+relative+pronouns PDF link annotation
    • http://radanews.site/xoxumininobosusugogoterafmmebw.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/1703722.pdfIn PDF document text
    • http://uspex22.online/918974122mhhmo.pdfIn PDF document text
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/xadinemapep.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/how_to_fix_lg_washer.pdfIn PDF document text
    • http://theandyhong.com/19147779398dstpu.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/31782178336.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/jijd77D/dulivajovusumelot.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/hlIhfvE/coupons_for_mcdonalds_august_2020.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/online_bible_study_tools_kjv9jm9i.pdfIn PDF document text
    • http://olymp-trade.top/894512976601pa54.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/HKhchcJ/nimodatuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakilasefit.myartsonline.com/fuzuxudemuzufup.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/9859216804.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/3417554207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1b1cc9-2764-4c9f-bacd-0437028246bd/continuum_mechanics_mase.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/dolitavit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd1c497-3699-4e09-a670-a3a9e30ed0ed/5990523634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91577306-4f90-4f3d-8b09-59b99378b355/fiwabeluge.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_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 5504 bytes
SHA-256: 758c53e4b30dd2105270adeb277f2ba0e798e4e4bc01dedc7ab27993c6bf83ab
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 10556 bytes
SHA-256: ec67cb9407f96a556e94d9679a93aa1fb296e3d422e5dbba0defe7bae398bef9

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