Malicious PDF — malware analysis report

Static analysis result for SHA-256 844c9a40672f854f…

MALICIOUS

PDF

36.0 KB Created: 2020-06-12 01:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab3cd1920d82d04c88571ccae675170a SHA-1: 72f9077573812af5a320e795f67e51fa44f289e5 SHA-256: 844c9a40672f854fdd9887000219d8784615f43a0a9870df1216d879db6dde7c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are structured as SEO spam or potential phishing lures. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm. The document body itself contains obfuscated text and URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://web3.pleasingfood.com/uploads/1/3/1/8/131856232/131856232.html#se+500+datavideo+manual
    • http://advancedarsenalnutrition.com/uploads/1/3/1/4/131438667/tafivexapazoroguli.pdf
    • http://eventbrancheduitsland.nl/uploads/1/3/0/7/130738777/a419be03b1a4.pdf
    • http://mjtcounsel.com/uploads/1/3/0/6/130621485/sujewe.pdf
    • http://tooprettyforjail.net/uploads/1/3/0/6/130621300/sibonatotixim.pdf
    • http://new.boslerhs.org/uploads/1/3/0/5/130589045/34bff83d35e114.pdf
    • http://brownscarpetcare.net/uploads/1/3/1/0/131070227/buvinupabege.pdf
    • http://moonlightled.ca/uploads/1/3/0/2/130271030/bd61e8c3ec.pdf
    • http://vardarholdings.com/uploads/1/3/1/3/131381078/vivewubizojimigako.pdf
    • http://vidashow.com/uploads/1/3/0/7/130740522/nilofopapilefumosev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://biwijemafag333112286.files.wordpress.com/2020/06/43796439628.pdf
    • https://tolefeguxi.files.wordpress.com/2020/06/totufolabizu.pdf
    • https://zepowep.files.wordpress.com/2020/06/97496921946.pdf
    • https://banaxog.files.wordpress.com/2020/06/98215947904.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b5.bin
94d5752dff1e12c9491960f317880f058adecc996dcc092164d4b422524f7455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 10656 bytes

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