Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d798a6336c6acc4…

MALICIOUS

PDF

50.6 KB Created: 2020-03-12 06:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7d82bac31d516a6aa02614b237ab87bf SHA-1: 484793837729ef6eb685da5956d2ced05c9306b0 SHA-256: 5d798a6336c6acc4ae2488ca11a183b091f5b087f6a9115ea3fd79215fbe9cf8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent. The document body contains garbled text and embedded URLs, further supporting the link farm hypothesis.

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://mail.bardosdiamondsports.com/uploads/1/3/0/5/130544446/130544446.html#yamaha+acoustic+guitar+owner+manual
    • http://syracusechildrenschorus.org/uploads/1/3/0/5/130589413/a26913c59b571.pdf
    • http://dirksimon.biz/uploads/1/3/0/7/130739117/nudabi_sifivirar.pdf
    • http://mx.albertogonzalezvivo.com/uploads/1/3/0/5/130588395/6094773.pdf
    • http://northolmesjuniorschool.com/uploads/1/3/0/7/130776828/5092092.pdf
    • http://mattsrecycling.com/uploads/1/3/0/6/130621141/wijada.pdf
    • http://mail.congbethdavid.org/uploads/1/3/0/7/130739810/3157448.pdf
    • http://spmfilms.net/uploads/1/3/0/5/130550750/kadupikuw_dapadam_zubufuragozox_kononesoguxe.pdf
    • http://rmus.tech/uploads/1/3/0/8/130874422/13408c80b.pdf
    • http://parattack.org/uploads/1/3/0/8/130813663/buwuwaxobejiz-benuxepaf-tobibepovomit-pivodiw.pdf
    • http://wkyautos.com/uploads/1/3/0/5/130550775/jirijexabukamosur.pdf
    • http://candacekoslen.com/uploads/1/3/0/4/130436367/padodeninuxi.pdf
    • http://thejamtastics.com/uploads/1/3/0/3/130313588/pimemiwinopidoni.pdf
    • http://cpanel.share-en.com/uploads/1/3/0/7/130738863/volisafalazaj-jisubasux.pdf
    • http://jhrpropertyltd.com/uploads/1/3/0/7/130740444/nonemefitunim-powanekulonew-zipur-pizusokezeva.pdf
    • http://diradevelopments.com/uploads/1/3/0/5/130588515/9306131.pdf
    • http://www.hidders.com/uploads/1/3/0/7/130775707/b82e829cc9cd.pdf
    • http://bedfordcapitalgroup.com/uploads/1/3/0/2/130272234/b5bc00c1e.pdf
    • http://mygrmobilervrepair.com/uploads/1/3/0/2/130291545/xipinenufere_vemileneki_navuj_zuzodes.pdf
    • http://zoommyrent.com/uploads/1/3/0/6/130621864/3ef22884afdab.pdf
    • http://liveimageproject.com/uploads/1/3/0/5/130539660/bilafotat_laganagur_levilivinujuzir.pdf
    • http://teshekpuklake.com/uploads/1/3/0/5/130545434/nodimomagiwe.pdf
    • http://experienceperfectwindows.com/uploads/1/3/0/4/130483346/9321635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dd2.bin
b3c95ff3ac3636edc7d216756c58adb46b0872089d5e1a5ea48e34564ad212fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 7880 bytes
font_01_sfnt_off00009c92.bin
cf5e934e27da8c68fa523f59cb9b8d72b26bdbf3c356e59667281e7289f065e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C92 3088 bytes
font_02_sfnt_off0000a6a6.bin
3bdbc085f965e146ffc4213548546bf01a969058a3a3e72f105e7902f99a3cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A6 16100 bytes

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