Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf09427af2dedde…

MALICIOUS

PDF

58.7 KB Created: 2020-03-23 12:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb0f2a83747c177cd192afda667f1b33 SHA-1: 8cc4f07d8412ea7aa1036ed3a9f4089f659ceb50 SHA-256: 1cf09427af2deddea7df111e8a9c29a2de6bf83330375c5683e57cc7edd7b9ce
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body is heavily obfuscated but contains embedded URLs. The primary function appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content. 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://lifteens.com/uploads/1/3/0/3/130313000/130313000.html#que+grados+comprende+la+educacion+basica+primaria+en+colombia
    • http://hospitalsonespases.info/uploads/1/3/0/6/130620154/tofasejox_jepuga.pdf
    • http://timception.com/uploads/1/3/0/6/130604427/dokemebuxupizu_zakerigetirupit_kivan.pdf
    • http://pleasantcommunities.com/uploads/1/3/0/5/130588231/mezizexivanuja-noruluvo-lilezitilosero.pdf
    • http://limosinkaty.com/uploads/1/3/0/2/130272284/6507900.pdf
    • http://chuyitos.com/uploads/1/3/0/4/130476101/fasejipije-zebirew-sakuf.pdf
    • http://salvosurfboards.com/uploads/1/3/0/8/130874380/kumuf_bisabuk.pdf
    • http://sierraedgarbyu.com/uploads/1/3/0/6/130639653/7b092adca11.pdf
    • http://nikkiheatsales.net/uploads/1/3/0/2/130274269/robenawak.pdf
    • http://www.stylingcantaluppi.com/uploads/1/3/0/3/130323381/c75ea9731d98b4.pdf
    • http://harlemrose.com/uploads/1/3/0/3/130324191/c8371ebc.pdf
    • http://kmgfarms.com/uploads/1/3/0/7/130739789/kofesorerituza.pdf
    • http://forwardesigner.com/uploads/1/3/0/5/130550887/96e5d95e.pdf
    • http://www.vanislandvehicledesign.com/uploads/1/3/0/8/130874566/2544229.pdf
    • http://lisemazerolle.com/uploads/1/3/0/6/130604765/272f15b772425.pdf
    • http://hdhlouisville.com/uploads/1/3/0/5/130550994/d357469e1f0f.pdf
    • http://hostmaster.senisilatcapetown.co.za/uploads/1/3/1/0/131070567/5957688.pdf
    • http://bysociety.com/uploads/1/3/0/8/130874671/a745ecd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b32.bin
2849973fbee988f6fe9fb08002ce545e3e245f5450f413dded9c2ce52f6ac9bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B32 9208 bytes
font_01_sfnt_off0000bc3c.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 2652 bytes
font_02_sfnt_off0000c5a3.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 16036 bytes