Malicious PDF — malware analysis report

Static analysis result for SHA-256 a807415473e00f28…

MALICIOUS

PDF

43.8 KB Created: 2020-03-21 20:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8467ab23bd06ee90dbd877fb234adb4 SHA-1: ecf5d2991e370800fd6ca95f47eedd3a9fa62ec5 SHA-256: a807415473e00f28b8ad90bce517c07ef41ef55c52cb66e798eefb6f661f56b2
94 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 PDFs hosted on various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of this network. The primary attack pattern appears to be directing users to a large collection of potentially malicious or spam-related 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://churchstrettontaxi.com/uploads/1/3/0/6/130603761/130603761.html#punnett+square+word+problems+doc
    • http://www.rtcases.com/uploads/1/3/0/4/130477039/xipakopipabuj.pdf
    • http://fritly.com/uploads/1/3/0/4/130476720/fazokogalix.pdf
    • http://www.smaxmusic.com/uploads/1/3/0/8/130814439/6387657.pdf
    • http://duck-page.com/uploads/1/3/0/2/130271102/b71fec78c0.pdf
    • http://www.stretchout.com.au/uploads/1/3/0/6/130605312/9424049.pdf
    • http://allbacksosteo.com/uploads/1/3/0/6/130639533/nuxotorevigekum.pdf
    • http://hostmaster.ways2change.de/uploads/1/3/0/7/130739351/mukuvibazamaze.pdf
    • http://ns.forestlanebotanicals.com/uploads/1/3/0/6/130604312/bb886c0.pdf
    • http://nsiteanalytics.net/uploads/1/3/0/6/130621776/morosarorogilif-fedivivive.pdf
    • http://littleyogis.co.uk/uploads/1/3/0/6/130603867/fubimuwon.pdf
    • http://www.bodyartanddesign.com/uploads/1/3/0/4/130488734/wigunafig_nuboxazopiravev.pdf
    • http://allbummedout.com/uploads/1/3/0/5/130545098/06988d93703fd.pdf
    • http://storringtondfas.org/uploads/1/3/0/6/130620437/sumopop.pdf
    • http://tools.younaturalbodycare.com/uploads/1/3/0/4/130435895/sumipadokuri.pdf
    • http://alcantaraorozco.com/uploads/1/3/0/5/130589427/janelifikivula.pdf
    • http://noisomheden.com/uploads/1/3/0/6/130621437/6964bb3a4f465.pdf
    • http://www.californiawineryshuttle.com/uploads/1/3/0/5/130541552/xurebirekaripunugala.pdf
    • http://amhrconsulting.com/uploads/1/3/0/6/130621412/guziwevovof.pdf
    • http://mengdid.com/uploads/1/3/0/4/130435737/zanule.pdf
    • http://therightdoor.com/uploads/1/3/0/2/130289550/zakufarabonusi.pdf
    • http://www.simonepaganelli.com/uploads/1/3/0/5/130588847/bupegapafogalom_wobigivogenavub_detof.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075a9.bin
e618623a8bddaaa6240033dd22f9bca5fa0363b19b4b625ee0f6bba98da0d05b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 8576 bytes
font_01_sfnt_off00009616.bin
1b3f82cd74c5b6671cc0c0d4a6c7877b74bb57ca469b2a61ef541918e41af838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9616 2652 bytes

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