Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4ef9aae6274887…

MALICIOUS

PDF

74.4 KB Created: 2020-04-01 18:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: dde9c8d7f36320258baad1754acdb6ce SHA-1: 83db045c3a3bb9aab0c6c5bc716ef31659806a9d SHA-256: ac4ef9aae6274887382d45f5fea9aec3ce8dd596ee6bb86d98b8a33f145cf392
104 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains text related to 'daily use english vocabulary with hindi meaning pdf', likely a lure to disguise the malicious intent. The presence of a visual download button further supports a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mopeg.net/uploads/1/3/0/7/130739806/130739806.html#daily+use+english+vocabulary+with+hindi+meaning+pdf PDF link annotation
    • http://youremakingthatup.com/uploads/1/3/0/5/130589090/fimepatanulesub.pdfIn PDF document text
    • http://smarthomebros.net/uploads/1/3/0/7/130739697/3933007.pdfIn PDF document text
    • http://mountainmindful.org/uploads/1/3/0/7/130738680/49a10b21399.pdfIn PDF document text
    • http://happyboutiquetrucks.com/uploads/1/3/0/4/130489265/jarulanuxivusulal.pdfIn PDF document text
    • http://powerglidr.com/uploads/1/3/0/3/130323642/sufeg.pdfIn PDF document text
    • http://irritables.com/uploads/1/3/0/7/130775248/56ec7cefdc124ee.pdfIn PDF document text
    • http://christopherjernberg.com/uploads/1/3/0/6/130639380/koropa_kesugaradug_mifaz.pdfIn PDF document text
    • http://glasshousecafemq.com/uploads/1/3/0/4/130483242/8740540.pdfIn PDF document text
    • http://construccionysuministros.com/uploads/1/3/0/7/130738933/xafupagir.pdfIn PDF document text
    • http://victorseventroom.com/uploads/1/3/0/5/130545957/a6d4bbd2b.pdfIn PDF document text
    • http://sapporobeauty.com/uploads/1/3/0/6/130604919/puzoxefejimegit_vutigozur.pdfIn PDF document text
    • http://fwd-momentum.net/uploads/1/3/1/3/131379380/nozojasatu_tegeduvumanego.pdfIn PDF document text
    • http://navinbapat.com/uploads/1/3/0/6/130604006/141158.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000baee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBAEE 25956 bytes
SHA-256: 1d56cb81dbcac4de0a9ef1336ef701a9ebf8a3338b5b3e986b06bfd57f5450d8
font_00_sfnt_off0000951f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x951F 7744 bytes
SHA-256: d901813af00f7be2288d097a8f64527be0bb5344b3a7455cf7d7381ca940f4eb
font_01_sfnt_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 1388 bytes
SHA-256: 1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0
font_03_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 17548 bytes
SHA-256: 86c393fe4b9531639f0f5505f138c4f68d7492b2d4c85a153d0d7a79092f2eed

Open this report in the interactive analyzer, or submit your own file for analysis.