Malicious PDF — malware analysis report

Static analysis result for SHA-256 974093ef47f6c2f9…

MALICIOUS

PDF

77.9 KB Created: 2021-03-07 15:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 353c68ed3d66472a44c9915acb6ecc2c SHA-1: 62e51e6eb2f73c8dfa78f79fc70f6e873be3d18b SHA-256: 974093ef47f6c2f925520cfee9ed88593cf0e2c89e68aa2f9106ce67796260ff
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDFs hosted on numerous disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/award?keyword=bandicam+serial+key+and+email+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_6020a4b80fc84.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/zgezicA/radagupoxijegiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386595/normal_5ff40ee1a276a.pdfIn PDF document text
    • https://favapebunekef.weebly.com/uploads/1/3/0/8/130874429/596739.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/vovubuvozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_5fd814fb995f7.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/xiwerorasewogijabzsdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fd27b6de4cd2.pdfIn PDF document text
    • https://futinubub.weebly.com/uploads/1/3/5/3/135328842/lenexiwotagulin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6018cd3dbdde4.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/VIhdudv/kujopovajixerofubixigozof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_5fd8fa1368b34.pdfIn PDF document text
    • http://raifaisentapp.online/kebitebokojijudipuskaayb.pdfIn PDF document text
    • http://salonly.xyz/work_from_home_tech_writing_jobs1rza7.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/relation_between_electric_and_magnetic_field_in_em_wave.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/jjieBpn/zombie_attack_2_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/LhfibIM/warivupapoki.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/v0haEhh/60058742317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fedc775735da.pdfIn PDF document text
    • http://1freedom.space/never_eat_alone_chapter_summaryg8buy.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/cnn_latest_political_news_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_60255893c1cff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/jelij.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_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 5384 bytes
SHA-256: 24424c392649ecb52e3f6c7b76db62104416cb322f93b27430114c9a7c4fee05
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10520 bytes
SHA-256: 553dd039a6a493b8ff98e95179e8fc6f15a26637d4466c37267ecc47e65a860d

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