Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d78bf1e77affc56…

MALICIOUS

PDF

74.7 KB Created: 2021-03-09 12:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a5b6ea9ac435eb734bf0ee686fe0d6fe SHA-1: b645e0f1fa5389f781ffe18d4fa416e8a19f7b31 SHA-256: 4d78bf1e77affc56ff9a3c783a8b8466cc7164affe988b8366823a17ebd1f820
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or spam distribution tactic. The document body, though heavily obfuscated, contains references to 'unstoppable confidence' and NLP, likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=unstoppable%20confidence%20how%20to%20use%20the%20power%20of%20nlp%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412996/normal_6016e35150180.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405641/normal_5fcf492d8cf01.pdfIn PDF document text
    • http://goodik.fun/839687425039n5o7.pdfIn PDF document text
    • http://onlinetiser.website/classifying_shapes_worksheet1vyvf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_60286a1f17e6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5ff0df17dd28a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376362/normal_5fc6db795fef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_60435811cb2a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd2600d1867e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_6015015d8591c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_600352d09a27a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_6046029bd0864.pdfIn PDF document text
    • http://sehq.xyz/3301098875nw0f3.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/gigepumogidesituxcxkk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60116e5eb063e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_600fe45560ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_603360a3870b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5fd3bd308a46d.pdfIn PDF document text
    • http://onlinekartiadesi.com/doctor_michael_heyns5yszs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415935/normal_5fdfc83c401a9.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/jiwisigetizoxif/45418790448.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_ba772aeccb6c457abe11116e840ae899.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotidox/bloom_s_taxonomy_lesson_plan_template.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_366625ba9dda47d8918fe7a770a42c99.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_137dc4a94d3249adab39dbed9cf60df4.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_7ae8cce3649647718b7795560ddb4ec0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/77977235853.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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 5464 bytes
SHA-256: 71158ce5f7b1b50a5ab0b9fb6c82d7bf62e524472c29d8cd3bc603892d146101
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 10712 bytes
SHA-256: 633ca4776d801ed9d5a900f1071894d1490168c193a7440e47f8b32751aec1ff

Open this report in the interactive analyzer, or submit your own file for analysis.