Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c8c9562753cb83…

MALICIOUS

PDF

41.2 KB Created: 2020-05-21 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2875654577827731a123a1ff341368c7 SHA-1: 3490b346345bb5fa285eecdff5894a3cde34c070 SHA-256: 57c8c9562753cb83e55374bf3c9317ad0a59c5a6ac0d4058b31db092700b2cd6
96 Risk Score

Malware Insights

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

The PDF document contains a deceptive title suggesting an APK download and embeds a large number of external links, many pointing to other PDF files. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mta-sts.mx.stoicqabalah.com/uploads/1/3/1/8/131871739/131871739.html#benim+konu%25C5%259Fan+tom+apk+indir+cepde
    • http://birthingintentionally.com/uploads/1/3/0/6/130620427/nusadesukogizir.pdf
    • http://jbdrendering.com/uploads/1/3/0/3/130323126/dd680f2bd.pdf
    • http://lunaumbrawinery.com/uploads/1/3/1/4/131453051/voleb_popagaxizividis_bikutorubefawa.pdf
    • http://juneraymond.com/uploads/1/3/0/2/130289460/bikep-xezodadezofedo-luzelatul-wopotigurafe.pdf
    • http://allsaintsws.net/uploads/1/3/0/6/130621279/563222.pdf
    • http://moneyfest.com/uploads/1/3/0/7/130738697/dozogop.pdf
    • http://perfectprojectdocs.com/uploads/1/3/0/5/130589288/ledukerivezukilemev.pdf
    • http://bradsbistro.com/uploads/1/3/0/4/130476074/9b3d75b.pdf
    • http://sonicrepair.com/uploads/1/3/0/7/130738805/gefaluvobekif_noven.pdf
    • http://csparling.com/uploads/1/3/0/8/130814706/xuxamakopejakosu.pdf
    • http://languageofgiving.com/uploads/1/3/0/7/130739937/zuluvelomewenu.pdf
    • http://acupunturaymas.com/uploads/1/3/1/4/131482968/bivobatelukoloxaz.pdf
    • http://pheonixcreations.org/uploads/1/3/0/2/130270742/dipugekirap.pdf
    • http://pool-leak.vip/uploads/1/3/1/4/131412426/9ee5aa78476b3.pdf
    • http://greensremodelingandrestoration.com/uploads/1/3/0/6/130604931/pagozususam.pdf
    • http://unbearablelightnessofbeing.com/uploads/1/3/1/4/131454383/8865143.pdf
    • http://sheffieldacres.com/uploads/1/3/0/2/130289729/nasaku_varub.pdf
    • http://hubstationeryaustralia.com/uploads/1/3/1/4/131455198/tojasatuve_gofikivan.pdf
    • http://aquaservant.com/uploads/1/3/1/3/131384424/gunezip_nugeve.pdf
    • http://germanpinscherpuppies.com/uploads/1/3/1/4/131407080/womuw.pdf
    • http://stealingtheinterview.com/uploads/1/3/0/5/130550785/cbe1f531110a26a.pdf
    • http://mbatesdesigns.com/uploads/1/3/0/6/130621402/jewulinetuloxofoto.pdf
    • http://pledgeagainstbulling.com/uploads/1/3/0/8/130874612/xurom.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_off000067d8.bin
82763fcbfb34bd48129dfec6806877e3f41a440b2e822d4e090939f9eebcbd8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D8 2196 bytes
font_01_sfnt_off000071d3.bin
31cb6ca6e4d6b9ae843a98c0bc52a7d5046de8a21518fc6357e5b45ca6810c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D3 11556 bytes

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