Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7309831a22deeb0…

MALICIOUS

PDF

89.9 KB Created: 2021-03-20 18:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 637f1243f7563b22c484f41fe0dafdfb SHA-1: eb93e8604d82fd5490769e0da774bdda21b415e7 SHA-256: c7309831a22deeb04aaff91080380f5dd12c72db2b1649b8de7b17ff1eab83df
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 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

  • 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://bologen.ru/award?keyword=who+s+afraid+of+virginia+woolf+full+play+pdf PDF link annotation
    • http://palaxofivuleduj.medianewsonline.com/mitilutozaxanoreradanawip.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/7185785.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/how_do_you_know_if_a_baby_is_done_breastfeeding.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/b3ad94d8a29.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/tuzarikogokavob-zidejodafi-gobugo-fotipabi.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/93201746292.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/5388475.pdfIn PDF document text
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/8675204.pdfIn PDF document text
    • https://resusogid.weebly.com/uploads/1/3/5/3/135346187/6673505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/36558046582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b86f431-b6cf-4022-a099-e96c84e3c4bc/paripodoxolazobetajuj.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/dexexowiwujegumeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebea644-10b7-40c1-9245-40d431a9efad/how_to_get_cracked_minecraft_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3991652d-92e1-4e17-871b-8bdf3909583f/83619823518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f3f999-8fbd-461c-b688-c33974cac8a5/78904345917.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/chucky_child_s_play_3_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d110b9-6e29-412b-9669-96e438b45a39/mebalowemokeduzajowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753ad06e-e7a4-486f-ba8b-1662abe49155/bililojanirali.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/how_to_get_started_on_the_dash_diet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 5572 bytes
SHA-256: d987ce6f7cbb74a6b6a90fceceff644e53eba1f23bcbb854c6e44fb703ca3e81
font_01_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 10568 bytes
SHA-256: 930563084d4af98acd4b4737156779c0486b5a3fe76670585e2c6c7c58fd6a0b

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