Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef495f3a3791d26…

MALICIOUS

PDF

37.8 KB Created: 2020-03-30 02:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 231ea8cfcc9fc060e8b8fb2a5fd947ab SHA-1: e9f615c2a8ae73bcb1ac6ea4ff265df083c0fbf7 SHA-256: 2ef495f3a3791d26ee8fb9f9f0628655a7a16087c6737de80886b7ae7e39049c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to factorization and products, which appears to be a lure. The primary function seems to be directing users to a vast network of linked PDF files hosted on various domains, potentially for SEO spam or to distribute further malicious content.

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://monteschoenstatt.org/uploads/1/3/0/5/130588834/130588834.html#casos+de+factorizaci%C3%B3n+y+productos+notables
    • http://englishinsights.com/uploads/1/3/1/0/131070525/vefogavon-wijenusurenagag-disefuwowexejak.pdf
    • http://jameshealthjourney.com/uploads/1/3/1/4/131405927/zilemadimoxaz-xawoluweninejon-bijasezojobasow-sonuxetupusej.pdf
    • http://easyleadsdigital.com/uploads/1/3/1/0/131070027/9267633.pdf
    • http://whitnallwire.org/uploads/1/3/0/8/130874211/9793732.pdf
    • http://mcclainscatering.com/uploads/1/3/0/6/130639729/lenewikepej-damesefirujod.pdf
    • http://palmcoastflautorepair.com/uploads/1/3/0/6/130604984/julomizepoluze-povavufuliba-pijasaj-rerewubobuxavi.pdf
    • http://bancodetalentos.org/uploads/1/3/0/5/130547024/xupakimamitiwiw.pdf
    • http://aquasearchglove.com/uploads/1/3/0/6/130605383/wematepe-diwiwamikatavo-jifadiravo.pdf
    • http://aquabluepoolspa1.com/uploads/1/3/1/1/131164488/pilegafob.pdf
    • http://thelauragalegroup.com/uploads/1/3/0/7/130776085/8685422.pdf
    • http://pansyandivy.com/uploads/1/3/0/4/130435601/89b2cdf.pdf
    • http://robi-anderson-edu.com/uploads/1/3/0/6/130639241/16952ff.pdf
    • http://visasparaturistas.com/uploads/1/3/0/5/130543545/faxulozi.pdf
    • http://arandy.net/uploads/1/3/1/0/131070379/890652.pdf
    • http://webdisk.wordwriteshop.com/uploads/1/3/1/4/131453480/besajo_debajedofu_dovim_fatonokaniked.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a35.bin
1bc15ba8492dc1bf1390f52353d2a2f124fd36308049e47717ce9ec3dc18dc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A35 7996 bytes

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