Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04f3a1d780e5ed6…

MALICIOUS

PDF

47.8 KB Created: 2020-03-29 07:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: a9b3bd9a6c9861e88ce03b3c0d7a65cd SHA-1: cbeb1433cd428dce8a82fdc334f5c3faa35e6bc4 SHA-256: d04f3a1d780e5ed6abd516b66837002b787c6b6813116d4a2e7cc472b3b2f164
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern involves directing users to external resources.

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://loskuatro20decalifornia.com/uploads/1/3/0/4/130483551/130483551.html#diferencia+entre+ohsas+18001+y+iso+45001+ppt PDF link annotation
    • http://bennyjmusic.com/uploads/1/3/0/7/130739196/sirusijexi.pdfIn PDF document text
    • http://chainhammer.net/uploads/1/3/0/8/130814579/4127a0c6a72af63.pdfIn PDF document text
    • http://hostmaster.harkwell-labels.co.uk/uploads/1/3/0/4/130483412/sivege-palezel.pdfIn PDF document text
    • http://thelauradasilva.com/uploads/1/3/0/5/130541221/xibanewor.pdfIn PDF document text
    • http://sharkineurope.com/uploads/1/3/0/5/130544232/sirajiv.pdfIn PDF document text
    • http://sistersforsocietycorp.info/uploads/1/3/0/4/130488157/numuxosawema.pdfIn PDF document text
    • http://nordykeart.com/uploads/1/3/1/3/131380555/8438534a8143d2f.pdfIn PDF document text
    • http://www.wfsomstudentshop.com/uploads/1/3/0/5/130543798/zikulosaxili.pdfIn PDF document text
    • http://bspinportfolio.com/uploads/1/3/0/3/130323697/0a3d7099e4b.pdfIn PDF document text
    • http://kestrynscove.com/uploads/1/3/0/9/130969923/9624455.pdfIn PDF document text
    • http://www.turnheadcarwrap.com/uploads/1/3/0/6/130640032/dd873e2c560a55.pdfIn PDF document text
    • http://artblog.studio/uploads/1/3/0/6/130639766/sopaxarepufu_tazubeb_ludoti.pdfIn PDF document text
    • http://hbys.services/uploads/1/3/0/6/130604031/7468e8a73fcb.pdfIn PDF document text
    • http://knotagainmassage.com/uploads/1/3/0/3/130323277/3684383.pdfIn PDF document text
    • http://frenchstarlette.com/uploads/1/3/0/7/130776509/zovorupowev-xexekigagibezu-sudadef.pdfIn PDF document text
    • http://www.peaceloveyogaindex.com/uploads/1/3/0/3/130313370/fuzejafaboxavolosa.pdfIn PDF document text
    • http://polevaulter.net/uploads/1/3/0/9/130969845/3c5452c3211e3.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 1

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_off00007cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB1 8224 bytes
SHA-256: 62b0d2674aef46d28d216ff89d78753d41ffe54e58069df3c80f347c175581d6
font_01_sfnt_off00009acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACD 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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