Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e04e1c5d24b732c…

MALICIOUS

PDF

80.0 KB Created: 2021-04-02 12:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5bfb4693edc0f046f456009c46d942a6 SHA-1: 9d75ea039a08229b451041c43fe6d79684e275eb SHA-256: 9e04e1c5d24b732c9e74c37d69d4379f4cfa311518c0b8f9520a9e9e3c833ee5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many hosted on disposable domains. This strongly suggests a phishing or malware distribution attempt, likely using spearphishing as the initial access vector. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=araby+short+story+analysis+pdf PDF link annotation
    • https://cdn.sqhk.co/simosukolevo/9hblptx/17816250879.pdfIn PDF document text
    • http://lefenup.22web.org/16297927931.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/hgxaghC/fedematos.pdfIn PDF document text
    • https://wojumujar.weebly.com/uploads/1/3/5/3/135396772/moxelugubexedes.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/ghJKm8a/fiwuwamisaduzupazixigesis.pdfIn PDF document text
    • http://vakafubetax.iblogger.org/happy_birthday_wishes_song_for_brother.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/Chao3je/75647112340.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/kutugi.pdfIn PDF document text
    • https://nafipitomaw.weebly.com/uploads/1/3/5/3/135349771/1816413.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/OjeShcF/pevuler.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/3008306.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/f8eee032fb39c.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/cuhduwp/81966493218.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/jfPgetp/42756564452.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/aj3gcEj/gexekureko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a996719-4efb-4797-8da9-67a035575642/databases_illuminated_solutions_manual.pdfIn PDF document text
    • http://viromumixemet.rf.gd/best_video_editor_android_app_2018.pdfIn PDF document text
    • http://donafilozevore.rf.gd/english_speaking_test_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/56016529626.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/guided_by_voices_2018_setlist.pdfIn PDF document text
    • http://rolefig.rf.gd/715585384.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/schedule_a_2018_irs_tax_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f58f79-fb27-4c7a-96e7-59ce4d0528ab/psychology_books_to_read_before_college.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_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 5360 bytes
SHA-256: f0720973aca0fc1331df16d22c349c908b3449771053e44e44e68c1b0bd4c9ab
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 10704 bytes
SHA-256: c4fd6322429ffef5763241d4c60fa1af6cfbbf1bd338590655491c07655c370d

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