Malicious PDF — malware analysis report

Static analysis result for SHA-256 105aa8a556e2ac35…

MALICIOUS

PDF

75.9 KB Created: 2021-03-01 04:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 68c8bb8a6a8a33d041531dd0cf698d35 SHA-1: ec634f1c9cb7329c2570577b75a505406c290fab SHA-256: 105aa8a556e2ac3540c3aac5ac22324a439350fe740e8d0712000d0f76aab359
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though partially corrupted, contains a search query related to connecting a JBL speaker to an iPhone, which is likely a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=how+to+connect+jbl+flip+4+to+iphone+8 PDF link annotation
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/2324033.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/795075.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/vovakubob.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/8523206.pdfIn PDF document text
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/6347554.pdfIn PDF document text
    • https://jozugirizozixus.weebly.com/uploads/1/3/2/3/132303278/nulaj_diwuzezireguf.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/todagatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soruseripekibe.rf.gd/material_science_graduate_school_ranking.pdfIn PDF document text
    • http://vevojadiren.epizy.com/mandatory_reporting_past_abuse.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/juradimes.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/bluetooth_app_for_pc_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/memojo.pdfIn PDF document text
    • http://lepamiruketujuf.epizy.com/love_potion_number_9_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/madawizulivanegosu.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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 5172 bytes
SHA-256: 4fd860afbedc4939a3b7308240fe95e628097a78c8377cdfd68261008ffa189b
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 2000 bytes
SHA-256: 52e472f967490b835777645f2b2c5761c91bb57c1745e5b802a673a5be698040
font_02_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10664 bytes
SHA-256: 5ee6d77458d533b4f707f730164fa78ae87a2bede7135d0e7206facb2919d4a5

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