Malicious PDF — malware analysis report

Static analysis result for SHA-256 407e6b02ece268e8…

MALICIOUS

PDF

78.1 KB Created: 2021-05-28 21:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ff6fd11b1f85feed8e7e09e58c1da649 SHA-1: 49c11df6699a94dbbc5603f3d0f85cd03663324c SHA-256: 407e6b02ece268e8d927430d821c8b6ac41a59b684018f4d3f9e88327544ac71
186 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains keywords related to 'kindergarten colors worksheets pdf', indicating a lure to disguise the malicious intent. The presence of numerous external PDF links points towards a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/123?utm_term=kindergarten+colors+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392668/normal_6033541818d6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483623/normal_5fe5aa5e70df1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5ff256863db74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_604014b6c30c7.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/wolalet.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/sugivutovat.pdfIn PDF document text
    • https://medekokimezud.weebly.com/uploads/1/3/4/7/134748457/9852e7bc709b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_604620feae3e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_60273fd397b44.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/jijoz-dujozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5fc7a8892ceb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5ffff1437c7e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_6054ab081969f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409628/normal_5fefbd91d29b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_5fd3380104e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_606b4529b28d2.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/vuxoxegozonuvizut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5ffd451b05adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_603dd4dea5bd1.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/xopekexegukalotu.pdfIn PDF document text
    • https://poxesogu.weebly.com/uploads/1/3/4/8/134854809/wibepirukuper_rexenopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_606e2a2816827.pdfIn PDF document text
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/99043.pdfIn PDF document text
    • https://posanawefu.weebly.com/uploads/1/3/4/7/134711745/patazixofuzumo_rufabawavu.pdfIn PDF document text
    • https://pipumemudif.weebly.com/uploads/1/3/4/8/134866913/5db732fc01baa6.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://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_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 5332 bytes
SHA-256: fa43937134aa39b12f9d4666fa0c9b2067d192f089ebcf5d1e3d10fdb85044fe
font_01_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 10576 bytes
SHA-256: 67be3d7a49a4f5a2450395c29d788f4de77652c8fffb1fc9cfe74ba4ce7d6959
font_02_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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