Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd085869e670edd…

MALICIOUS

PDF

56.1 KB Created: 2020-03-31 22:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0efab70ccb602aa72e41ed551baa81ad SHA-1: e7fee8f577cd3282b8123e031501dfbd51979277 SHA-256: 1cd085869e670eddc6702739431838468cbb48202869e2e68d20a4cb5e178a03
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, includes a URL that aligns with the detected link farm. This suggests a tactic to manipulate search engine results or to distribute a large volume of content, potentially malicious, across many sites. 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://pbjconstructionllc.com/uploads/1/3/1/4/131437844/131437844.html#minecraft+bookshelf+for+enchanting
    • http://carakuandroidku.com/uploads/1/3/0/6/130639140/dewusetubezojab-ragutexetojam-pamadopebovofof-gaketugipi.pdf
    • http://cjenow.com/uploads/1/3/1/3/131379026/xolujijinixupiro.pdf
    • http://dalprimobullmastiffs.com/uploads/1/3/0/3/130379075/ribalisax-wasowuk.pdf
    • http://octoberfestlakeland.com/uploads/1/3/0/6/130604955/4378152.pdf
    • http://gensphereapp.com/uploads/1/3/0/4/130489363/3510725.pdf
    • http://ioneman.com/uploads/1/3/0/9/130969341/rapuro.pdf
    • http://bathmd.com/uploads/1/3/0/5/130540664/7495827.pdf
    • http://botoxformenatlanta.com/uploads/1/3/0/5/130589399/d9cf0807.pdf
    • http://westgatefleamarket.com/uploads/1/3/0/7/130740173/pevineb_mijefijuzeg_mopalavur.pdf
    • http://connectionsonthebay.com/uploads/1/3/1/4/131437778/navubonifuxoto-kafajemuda.pdf
    • http://feetforfish.com/uploads/1/3/0/7/130775119/rizupagixileru_wazepevi_bipeg.pdf
    • http://brandycarversmithey.com/uploads/1/3/0/2/130270937/zarevikizalites.pdf
    • http://piranhatrends.net/uploads/1/3/0/3/130323930/rejitabigelatin.pdf
    • http://joshkanownik.com/uploads/1/3/0/5/130589218/1adfdc07bef0.pdf
    • http://triplesssbeefjerky.com/uploads/1/3/0/6/130639173/8b721636.pdf
    • http://caninerulestrainingcamp.com/uploads/1/3/0/9/130969757/xogerenuvamosume.pdf
    • http://comfortfoodproject.org/uploads/1/3/0/4/130435695/gojesugetaruviworen.pdf
    • http://ly1.fr/uploads/1/3/1/4/131437778/pamisowogixekaje.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_off0000915f.bin
6bdc76abcf2a352ba7e1f5772b56c54876db77465f1f9664beca9a45aae3ab7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915F 9056 bytes
font_01_sfnt_off0000b3dc.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 2652 bytes
font_02_sfnt_off0000bd43.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 16036 bytes

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