Malicious PDF — malware analysis report

Static analysis result for SHA-256 c258a5e61485e516…

MALICIOUS

PDF

77.2 KB Created: 2021-03-10 19:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe404f783c4d3f60a5a8268b746adc88 SHA-1: 558768eab424b3b44a2c6cb26f06847e1adde386 SHA-256: c258a5e61485e5161bdfe4002c59107ea9a46f1e10417c177cae3ced1b8269cc
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 0.9995

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://midufefew.ru/123?utm_term=information+literacy+meaning+in+tagalog PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365659/normal_603f263182096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_603bfc4c49b1b.pdfIn PDF document text
    • http://podarokinsta24.online/darwin_and_the_beagle_alan_moorehead5fgf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_603ffc080fa55.pdfIn PDF document text
    • http://ita-bio.space/41538970084sqj7v.pdfIn PDF document text
    • http://muzotom.22web.org/can_resistance_bands_help_tone_arms.pdfIn PDF document text
    • http://repair-foto.ru/retujupavajedur7va13.pdfIn PDF document text
    • http://jsexj.fun/sotikosisunuxenetaba1m55i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_6038e182753a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_5fd22d337a093.pdfIn PDF document text
    • http://natorg.fun/3211891854564hpv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_6033ea6e2583e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446784/normal_60019cb166231.pdfIn PDF document text
    • http://myyshooop224.site/toastmasters_evaluation_form7jygg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff3d87eba39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_6046348eea549.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/sivanira/tuberculous_meningitis_guidelines.pdfIn PDF document text
    • http://lisirowi.rf.gd/elasticsearch_template_mapping_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/dalemukibosugewepuvegezot.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/1937767399.pdfIn PDF document text
    • http://tanozetodane.rf.gd/binomische_formel_rechner_hoch_3.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/aararum_kanathe_aromal_thaimulla_song_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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 5064 bytes
SHA-256: 1b27a231edfdfbdee213b1b6a5426beb2eb0e67f570c87df6598438d1f454ebb
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10636 bytes
SHA-256: b57e765f9f07ba2601655b0146ecdfb1b2f60f30636a5fe4991c861acaf7585f

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