Malicious PDF — malware analysis report

Static analysis result for SHA-256 de633dc407db2d3c…

MALICIOUS

PDF

75.1 KB Created: 2021-02-25 01:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6402a3a34f7d82aacd3df25c9190303f SHA-1: 0e7b27760a60676c8772aac632d7170db12c2e84 SHA-256: de633dc407db2d3c0bf7e4198a027bf0f00d2a0a7654bf9624e84ac2bcfc8645
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 0.9998

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://crophysi.ru/strik?utm_term=why+is+my+hitachi+tv+standby+light+flashing PDF link annotation
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/198671.pdfIn PDF document text
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/6366b.pdfIn PDF document text
    • http://apelsins.space/52434761100enx5m.pdfIn PDF document text
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/7323313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fe7ad9474187.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/kovabamakakufaf_bunegexilufab_sujuzomo.pdfIn PDF document text
    • http://cardioactiveitalia.site/cds_full_form_eligibilityfoi5o.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/bekaxir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5ff94cc82354d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5ffc68f9cb61d.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://tabifewegijip.epizy.com/chapter_7_apush.pdfIn PDF document text
    • http://kojajopi.epizy.com/undertale_undyne_theme_sheet_music.pdfIn PDF document text
    • http://volemefejosi.rf.gd/gamesir_controller_ios_pubg.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/manifesto_pakatan_harapan_johor.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_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 5216 bytes
SHA-256: 8b3f9bc92acee611748755609a51dca802e84d6f8192be01799e08c31ac3b148
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 10772 bytes
SHA-256: b12a8cc9638e821468e6647eb5ddf359cfa84746d3137f98ab5a83f7a0440e04
font_02_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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