Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac0e43cafd156a5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 00:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0f0d62aafd904bfab5778f3378a2ee82 SHA-1: 279c40becb94597218e95bfddd93ed0b0e118895 SHA-256: 4ac0e43cafd156a5e6631f5600ff01415a20a5e40acda9afdb9907d9d797be2b
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to host and distribute links to other potentially malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=hansel+and+gretel+movie+2015+download PDF link annotation
    • http://reabook.online/pomiwasadagufopufudewodad70aay.pdfIn PDF document text
    • http://idealicaitalia-official.site/nusomawi2pq7o.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/zivobaso_korifutubenoz.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/bedove_zekati.pdfIn PDF document text
    • http://1cats.space/snow_white_and_the_huntsman_trailer_deutschz8wmr.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/1379497.pdfIn PDF document text
    • http://logmeinnow.xyz/90312572982mor4f.pdfIn PDF document text
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/c2a023ce888cfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fe10e29bc7b4.pdfIn PDF document text
    • http://stebsmeh.space/regozuznlq6b.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/mapeg.pdfIn PDF document text
    • http://teenagetutor.net/omron_walking_style_one_2.1_pedometer_instructionsy0axw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_601512bf9fee0.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/gewuwasi/formula_del_volumen_de_un_prisma_triangular_regular.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/27362494102.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/tepixer.pdfIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_86b62154f118476180a9471d254a03a7.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_7b55412b019441629eae32a1020fb24f.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_af51ce8d4c8045f5b0576596b791888d.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
    • 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_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 5708 bytes
SHA-256: 722a612c6f8a8d956a1617dfbb7069b6f797b7a76626ce3f31697f7fe24971ba
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 11072 bytes
SHA-256: 850d0e0c5e5baca18c4818adb2e529774dfd484e39c13d9ff195ba7187938959
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 16060 bytes
SHA-256: e02432191d952bf4ca0be4cfeafc10308785ce9d9f3781c3262e4e8a73b31f63