Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce9f857eeeff4fb…

MALICIOUS

PDF

42.5 KB Created: 2020-11-07 20:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f4c456646bdc64dd3c833cc6d69d9858 SHA-1: 221fea49d410bde574a97f5711c22a2da53d4fd6 SHA-256: bce9f857eeeff4fbb8eb125044a42218e2d254d0a14a1082e759f19b130b3733
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 1.0000

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://trafffe.ru/123?keyword=key+club+cheers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gakibarum.files.wordpress.com/2020/11/88938693861.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/watch_fringe_online_free_hd.pdfIn PDF document text
    • https://nowikukiwego809870752.files.wordpress.com/2020/11/pupamogereb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d219c710-68e9-4e67-8da4-35ddee0589f1/paluvofoduwomubivigigorul.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://wubidexa.files.wordpress.com/2020/11/jezuzonepewedinaravelo.pdfIn PDF document text
    • https://zerujad.files.wordpress.com/2020/11/poluzanikijexisaveta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53acce0c-62c1-4f82-8363-99de633d5120/kosiluni.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/asymptotic_notation_tutorial.pdfIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://disabuwipe.files.wordpress.com/2020/11/48306232631.pdfIn PDF document text
    • https://liwefibago.files.wordpress.com/2020/11/deemo_song_unlock_guide.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_off00006347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 4888 bytes
SHA-256: d4305b4509ce5b5062ce0ff35babe87e649f61beb3c90eef125772c0d486bb53
font_01_sfnt_off000073ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EF 12972 bytes
SHA-256: b6014bb28af30f8ec6fc03d3f003194f982598bd4b31b01d6d38c19bf2f824e4

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