Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9c6a3b9f6baad9…

MALICIOUS

PDF

88.5 KB Created: 2021-03-20 11:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c785a39edd8384a4747c36aaf856a22e SHA-1: 1a6e90cd095f745b3a19ef535bc656978ce6c05e SHA-256: 1b9c6a3b9f6baad95612561fff340b3342056311ae89d86730c401dda746f644
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and external link farm are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=super+hot+unblocked+games PDF link annotation
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/noxoremaxug.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/rositepuz.pdfIn PDF document text
    • http://wowitaly.pro/cbr_test_resultsi8bjw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_6025ac56e79d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5ff19c75d102c.pdfIn PDF document text
    • http://musc-media.xyz/technical_english_1_course_book_answersxikik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_601f9c3d09778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_60062ad2ef518.pdfIn PDF document text
    • https://jafoxoxuxovawe.weebly.com/uploads/1/3/0/8/130813536/acc3b2618c389b.pdfIn PDF document text
    • http://detonic-romania.website/misusuwamapunorcx8mq.pdfIn PDF document text
    • https://romasagato.weebly.com/uploads/1/3/4/7/134723475/2264130a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501057/normal_6039680913ad1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_b8bb782b6bbc497785c574a9f1dc57c3.pdf?index=trueIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_d3e607705a264cfa991e95ec75c0057c.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_714e92d6ab504f5ab401cc7c344edabe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jagux/2013_yfz_450_owners_manual.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_59f90b1fb0a4400fbf1959e8d66bcd9c.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_6bc39080b32e453eaebd54af18440003.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/suwupuzixijokedoda.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_f2c2adc84ab04df2a44c8493e52f870f.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f8f52b34da0d41778aff4b1eab2d77a2.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_46ebee23ab7a42e9a0947d01a70ac56a.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_f087dd51855d4d3d8ecdb0013f652eeb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nigimul/ladikosokipaf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 5796 bytes
SHA-256: 333548497f5bf4613e21714d87c05f0387396d9cb349ba46ca9d0dda28997d33
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 13384 bytes
SHA-256: 9113947e3c4cebda52bf093dfb148b0d076526544602a601d6fade87d811c1b5
font_02_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501