Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bc4fe714acca47…

MALICIOUS

PDF

59.6 KB Created: 2020-03-29 06:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: c279228cca831c4e0ab9ba34d5812d30 SHA-1: 22da31c2e0c91402301b9c374b32aeb1309c5bc4 SHA-256: c7bc4fe714acca472cfe40c281612891eea7b02e0b5adf9ccb00c9deb40aa184
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly identified this PDF as malicious. The document body, though partially corrupted, contains references to the linked URLs, suggesting the primary purpose is to redirect users to these external resources.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://davidmarquesibanez.com/uploads/1/3/0/6/130605482/130605482.html#resumen+del+libro+el+secreto+del+fuego+rincon+del+vago PDF link annotation
    • http://harbourlightstrategicmarketing.com/uploads/1/3/0/5/130590666/lofixan.pdfIn PDF document text
    • http://youkulele.us/uploads/1/3/0/6/130621472/polusupefumake.pdfIn PDF document text
    • http://autodiscover.djhinton.com/uploads/1/3/0/7/130739598/5481900.pdfIn PDF document text
    • http://wendysmithnutrition.com/uploads/1/3/0/3/130313057/7049802.pdfIn PDF document text
    • http://server.concordneuropsych.com/uploads/1/3/0/5/130539370/pajokojoje_revid.pdfIn PDF document text
    • http://webmail.karriemichelle.com/uploads/1/3/0/6/130604646/3403758.pdfIn PDF document text
    • http://mostlytech.com/uploads/1/3/0/2/130291416/8118624.pdfIn PDF document text
    • http://shop.raptureherald.com/uploads/1/3/0/6/130603744/481626.pdfIn PDF document text
    • http://topdoglifejackets.com/uploads/1/3/1/0/131070362/tetutuxodakak.pdfIn PDF document text
    • http://flourishhealthmd.com/uploads/1/3/0/2/130289554/f19bb.pdfIn PDF document text
    • http://ryanhuff.net/uploads/1/3/0/2/130287852/raboxoba-nugibivuf-gezanolav-subonat.pdfIn PDF document text
    • http://mobilemultitasking.com/uploads/1/3/0/6/130604427/7176492.pdfIn PDF document text
    • http://www.123-villas.com/uploads/1/3/0/5/130545278/vukegigowi.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3A 9464 bytes
SHA-256: 649982e5746be2cadd5034bd8404effd666c8e300a610b31986602e57ed1b7a4

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