Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4bfc60160d1ee3…

MALICIOUS

PDF

50.1 KB Created: 2020-03-15 02:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 004ccd888ad171785edc08b79dc6852a SHA-1: 4a860445ba082063cf3909b47e487e6c1cd29f98 SHA-256: 9b4bfc60160d1ee3956f700ada39727cf48a0460509730057a43e940ae755669
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be directing users to a network of potentially malicious or spam-related content through these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://female.mediutopia.com/uploads/1/3/0/4/130477085/130477085.html#chopin+nocturne+no+12+sheet+music PDF link annotation
    • http://www.elevo.net/uploads/1/3/0/4/130488669/fujixok.pdfIn PDF document text
    • http://www.dmsaulnier.com/uploads/1/3/0/3/130313466/wudazakif.pdfIn PDF document text
    • http://k-cast.net/uploads/1/3/0/3/130379126/e04784f34534c9d.pdfIn PDF document text
    • http://dimensionalfinancialservices.com/uploads/1/3/0/5/130588681/1858231.pdfIn PDF document text
    • http://business.westernreservesc.org/uploads/1/3/0/7/130776321/1f550e6b9a.pdfIn PDF document text
    • http://originalaeropress.com/uploads/1/3/0/4/130476082/3042179.pdfIn PDF document text
    • http://rifugiovallegrande.shop/uploads/1/3/0/6/130639635/4674095.pdfIn PDF document text
    • http://prettysimpleorganizing.net/uploads/1/3/0/5/130540293/vejaloje.pdfIn PDF document text
    • http://nicolewilson.net/uploads/1/3/0/7/130739343/7623107.pdfIn PDF document text
    • http://leasepurchasephilahomes.com/uploads/1/3/0/5/130550931/wexovigisapesiver.pdfIn PDF document text
    • http://lightningbabe.net/uploads/1/3/0/4/130476412/c6b67b16c6.pdfIn PDF document text
    • http://universitycommercecenter.com/uploads/1/3/0/6/130620293/0570e38938.pdfIn PDF document text
    • http://projectwoden.com/uploads/1/3/0/7/130738915/695734.pdfIn PDF document text
    • http://supportersection.com/uploads/1/3/0/4/130488295/2064663.pdfIn PDF document text
    • http://masterrepairplumbing.org/uploads/1/3/0/4/130488301/8fec4.pdfIn PDF document text
    • http://ericcawley.com/uploads/1/3/0/3/130323405/suboda.pdfIn PDF document text
    • http://thejoysofjewelry.com/uploads/1/3/0/5/130539987/fba7dfedf.pdfIn PDF document text
    • http://www.vocalassociates.com/uploads/1/3/0/8/130813837/8326682.pdfIn PDF document text
    • http://buystrathconahomes.com/uploads/1/3/0/7/130738635/xopumedi_gepagunifodib_xabavevew.pdfIn PDF document text
    • http://buyeveryinglobal.com/uploads/1/3/0/4/130435619/6b8dca.pdfIn PDF document text
    • http://teamlanternrouge.com/uploads/1/3/0/5/130550666/bobiv-mufusujakiruma-fupegozudoxup.pdfIn PDF document text
    • http://paigecooper.net/uploads/1/3/0/5/130551177/zibanutube-tajofavorojole-lalobefu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 9600 bytes
SHA-256: 0dbf5eef099492d8fde4d4d96848d5f848947dcd7aafcf50b7404a5c01e948f1
font_01_sfnt_off0000a4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E5 16184 bytes
SHA-256: 209a1914dac8e9aac3c16c0a9081bcc733128533442ca7fed933fc343c2e6065

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