Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6435836a6f015ae…

MALICIOUS

PDF

83.3 KB Created: 2021-03-04 20:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b95d610f239e1b64812d451232907d8 SHA-1: 279537824d5b2ddfa0df4acbf21227e21f46f508 SHA-256: b6435836a6f015aed3fc4094626004c992684c24d180c9c3869c1f36a4817584
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dafemum.ru/wix?keyword=candy+apples+dance+studio+owner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420907/normal_60106c811a6c7.pdfIn PDF document text
    • http://organicnu.info/25593535020crbxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fce52690d6fa.pdfIn PDF document text
    • http://panedapupugaxe.22web.org/79838210260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5ff6ade8e612f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_602223e41405f.pdfIn PDF document text
    • http://samozanyat.info/how_to_repair_gas_oven_knobp4xm2.pdfIn PDF document text
    • http://zebrait.fun/zuduwokilosixunawobubeq0nbk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_600fba89baefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5fc5f1a89585c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_6009da1b55ab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_60284073492e4.pdfIn PDF document text
    • http://pogadai.xyz/do_you_capitalize_the_day_of_the_week_in_a_sentencend1gl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toramowajo.epizy.com/5th_grade_math_word_problems_workbook.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_9f655aef05074c7181947d1e91ee6aa8.pdf?index=trueIn PDF document text
    • http://rutipozi.epizy.com/sowusikenamojugefe.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_8b6ac659c8ed41a4b3f0a60cedf42a12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feseni/10168462444.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_c97dbdaf21a84333b243e729a72d4237.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/perurulexi/nosaniwasuzojafupexuzeviw.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/caslon_antique_mn_font_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 5168 bytes
SHA-256: 48b4d8b5da63032ffd065602c24319d98e8ba7c9da50e666f57da4f67b36a7bc
font_01_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 10288 bytes
SHA-256: d95852a445e3b5386238739146b8a2755bfbc03e54cdde2abb48b66a241150e0

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