Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4c5e25f4cc1de4…

MALICIOUS

PDF

76.9 KB Created: 2021-01-06 06:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ad64bd62dbfcb57b9e3e37e50bca0cee SHA-1: 94e45c1664555fc59060c0931520786c3a820e33 SHA-256: 6a4c5e25f4cc1de4262413b4065f0aef6b7740bb657bfe5f93308c987defe198
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on cloud storage and personal websites, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the extensive linking behavior is the primary indicator of compromise.

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 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.
  • 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://traffnew.ru/aws?utm_term=since+and+for+worksheet+pdf PDF link annotation
    • https://japowubameke.weebly.com/uploads/1/3/1/4/131483598/goxavubetiz_doxuxovafuji_pixaliparuribe.pdfIn PDF document text
    • https://mosawowogan.weebly.com/uploads/1/3/4/5/134511341/1885971.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/pajefuwu-vorozokozi-wonezagimixe-jijevofumoxe.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/3ghGS9Q/download_instagram_mod_apk_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fb8223a83c44.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/fuzonavotutapu.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
    • https://s3.amazonaws.com/jiguwuzobozobaz/vaxosegunobipujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46748ac5-aed1-4ff0-beb2-d82993c443f6/85897601907.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/human_environment_interaction_in_paris_france.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ed1cc1-8c13-4585-879a-6b4186991d1e/exercicios_sobre_a_minerao_no_brasil_colonial_7_ano.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/96015547456.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/android_imageview_onclick_new_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7eda38-2136-4664-a1f9-f399ab86d5f0/74910226165.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/85084575632.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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 5260 bytes
SHA-256: cb4e83d212ed908a885905cd2245e9bd32b2aafa6f0f94353cf1bd0b99af45ce
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10328 bytes
SHA-256: a6a011109dd0acee5212fccceec3523423ee1d8e5af1f8364518443b95629d7f
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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