Malicious PDF — malware analysis report

Static analysis result for SHA-256 1451d5d9d53b8ec4…

MALICIOUS

PDF

80.6 KB Created: 2021-06-04 22:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28e17ff6a40bd4cdf96f1110ab126fe1 SHA-1: 11eed7f3e9c1475d6588b38183e839dc5de505cb SHA-256: 1451d5d9d53b8ec41404f04f3201ddd38a695caf95c43494898dcfa249747cff
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/pbw?utm_term=arrival+full+movie+download+in+hindi+dubbed+300mbs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476437/normal_60222c61c8b10.pdfIn PDF document text
    • https://nazasakodaz.weebly.com/uploads/1/3/4/6/134667833/9055851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_606731020fc1a.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/5650996.pdfIn PDF document text
    • https://nolupomesu.weebly.com/uploads/1/3/7/5/137510536/wojefe_nuput_bidapuxoz_detuzaniwap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6017633e8556f.pdfIn PDF document text
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/1755564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5fdeb45cd6af7.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/bamov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_6035c832e32f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_604f36e02f81d.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/0187db7e7ed7.pdfIn PDF document text
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/sagogomusor_xabisogejage_mefezujali.pdfIn PDF document text
    • https://megeludok.weebly.com/uploads/1/3/4/5/134595993/7606518.pdfIn PDF document text
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/lusegoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ziduzobif.pbworks.com/f/code_triche_pokemon_noir_2_emulateur.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/bomobazerid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff983c12-9174-4301-bc43-c8c12212f925/naruto_shippuden_opening_1_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ee54e0-80a2-48af-a5d7-d2b38eade8aa/code_of_points_gymnastics_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b120d38-ec87-4dbe-95dd-cd760b0d74be/88668968981.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/f/bostitch_sb-1850bn_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1711ffbb-87ef-409d-b432-e282b5b052d9/60465178568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c225014-ff29-4149-a467-c0426855f88b/kibuwoxokedojem.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/f/29971330910.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/w/file/fetch/144603216/34150172681.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 5536 bytes
SHA-256: f394bd64f1a7852d960854c2afacb7c270a5776b9a34a56d5702c41e6f67293c
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 10528 bytes
SHA-256: 594b5943039fb1a05f41b6d57a9092a44e6f0f45e9ff2f0bb1d89cec37757e80
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2