Malicious PDF — malware analysis report

Static analysis result for SHA-256 644009c783e26633…

MALICIOUS

PDF

82.5 KB Created: 2021-02-24 11:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf2da7551b60ec5ef42c52894970a738 SHA-1: ac02d174a3bf63a32291501d0a4f48072c5249ff SHA-256: 644009c783e26633e1caa69d5f2487a687846a359d7b4470aa104fff74b38bef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://jottigo.ru/aws?utm_term=how+to+get+velocity+graph+from+position+graph PDF link annotation
    • http://ruwegekugite.22web.org/59958382336.pdfIn PDF document text
    • https://zufefofavenubu.weebly.com/uploads/1/3/0/7/130775539/pipaxedixum-volit-dogipenulapux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6031752e4c2bd.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/ziruzaditixelirit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_602e35188ed61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602474d8d4181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_6014900bf11e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453328/normal_5ff0efeac2a1f.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/commissioning_report_example.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://vivusefodubelep.epizy.com/14199855489.pdfIn PDF document text
    • http://mutazaxuduk.epizy.com/ba_1st_year_maths_book.pdfIn PDF document text
    • http://zowujobosega.rf.gd/zipomabeganunotixakokevod.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/sad_alone_boy_hd_wallpaper.pdfIn PDF document text
    • http://tezebidurob.epizy.com/amazing_frog__android.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/acknowledgement_sample_for_thesis.pdfIn PDF document text
    • http://kugugoroxe.rf.gd/88936685163.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 5432 bytes
SHA-256: bf612f1454f72355522a75a48e66aa3e4f65f33b5432a849f567df6fc93fcb1b
font_01_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 11192 bytes
SHA-256: 6416e80cab072bcf6173c0c52de886e0cdc5c3fcc61401f1f3178a890df4897a
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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