Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd81a1df96a3895…

MALICIOUS

PDF

78.1 KB Created: 2020-04-08 08:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-10
MD5: 580deabee7ff777592b890ca6cd14547 SHA-1: 18cb904e033dd4f414e3f1bf72006a9c299a3f0e SHA-256: fdd81a1df96a38959b1511e4ac80ce075804baf67f1ac4a8366ebdc537a70f51
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to uniquely named PDF files on different domains. This pattern is indicative of a link farm or SEO abuse technique, likely intended to drive traffic or host malicious content. The primary heuristic identified a link farm with 22 external PDF links, and another heuristic flagged an external URI. No scripts were extracted from this sample.

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://abagenciesltd.com/uploads/1/3/1/3/131398583/131398583.html#seiko+astron+8x53 PDF link annotation
    • http://madebyelizabethj.com/uploads/1/3/0/4/130483248/55e6a8243.pdfIn PDF document text
    • http://jackiefrankeditor.com/uploads/1/3/0/6/130605338/759815fa3ca0dff.pdfIn PDF document text
    • http://spectacularbraidinglair.com/uploads/1/3/0/4/130483918/julolazulev.pdfIn PDF document text
    • http://www.rhema.jezus.pl/uploads/1/3/0/7/130740562/e0040e90e.pdfIn PDF document text
    • http://crosswayscounselling.com/uploads/1/3/0/7/130775668/wusejo_muvoji_fakadevara_vigurudijesasej.pdfIn PDF document text
    • http://qualityservice365.com/uploads/1/3/0/5/130589219/7fe224a9c2.pdfIn PDF document text
    • http://sivrihisarhavagosterileri.org/uploads/1/3/1/1/131163863/6e0ba59.pdfIn PDF document text
    • http://kurekit.com/uploads/1/3/0/8/130873759/3fd1edf6a1.pdfIn PDF document text
    • http://elegantproductionevents.com/uploads/1/3/1/3/131398563/32e55e463.pdfIn PDF document text
    • http://ofcourseimhavingfun.com/uploads/1/3/0/5/130590567/xarigubal.pdfIn PDF document text
    • http://griefandwellnesscenterofdenver.com/uploads/1/3/0/5/130589286/galupuzusonebudozige.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://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8A 8236 bytes
SHA-256: 1807103642e04b3ac9d3cf827b3328635dad70c1953b897b26de1ec114b2700e
font_01_sfnt_off00009d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D29 39100 bytes
SHA-256: 2450f4cc2566c79f9e09c34430d53307377dea386ee76ac849c1dae52c9383b9
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16160 bytes
SHA-256: 2f79ba52acca039e5c354f09c372eb8b3e5c303dfc88b98fa2ec462876c681ba

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