Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbc389bdd4f362f…

MALICIOUS

PDF

88.9 KB Created: 2021-05-15 04:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 24a6414b19035ca212fa1b6339a65549 SHA-1: 48fda15b092a8830807c0909937c1f812438ad48 SHA-256: 1cbc389bdd4f362fa47067255cd9926534af4f8d5beb621553902897089c7995
186 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 hosted on disposable domains, characteristic of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=avatar+kyoshi+comics+order PDF link annotation
    • https://cdn.sqhk.co/vorebilifi/N7hbifn/34202613350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_6060968668c74.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/saromajotefiv.pdfIn PDF document text
    • http://wuxixezigitezir.mygamesonline.org/nejudemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5fe6b6903ecd2.pdfIn PDF document text
    • https://vepaxanejabag.weebly.com/uploads/1/3/4/3/134317352/voloju_wirixipo.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/ojiBhfb/73304841003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377401/normal_5ffac345bb88b.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/Jt7iehf/89426152230.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/printable_hand_lettering_practice_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fdbccd786b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_6017a9d581e8c.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/4245432.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/gOigfje/spectrobes_origins_cheats.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/xewifu.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/jefazaxal/bawogewuzumoxasumive.pdfIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_ba19748fd04a4e5496c56bbeee3f7ff7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/28513397632.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_6b65f1475be24f1b9bca072da9711e63.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_c22ae6d552c444d4b98346a8a5005ce1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/tuvakaserikun.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_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 5364 bytes
SHA-256: 4ab7ea88e5e2f6ebd6e7b9449c70365359abc5c85fb8895fae41fa22be090d5c
font_01_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 10552 bytes
SHA-256: 7418183fa9a8399b81243a3a9d86bbd0a008961343483004431ef60e06c1651e