Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d37c62391b2907…

MALICIOUS

PDF

44.5 KB Created: 2020-03-15 01:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5188a91787565d9e6d811a1f6ffb4b0b SHA-1: 54aaa92749728198e20950079be800cdff41fe95 SHA-256: 11d37c62391b290774c92e36d202c07e78e15b3addf51b3689161d59011b0afe
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links disguised as an exam date sheet, likely to trick users into visiting malicious websites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a large number of external links, suggesting a link farm or redirection scheme. While no scripts were directly extracted, the presence of embedded URLs and the document's deceptive content point towards a phishing or redirection attack.

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://74-123-72-38.mgwnet.com/uploads/1/3/0/5/130550847/130550847.html#cbse+board+exam+date+sheet+2018-+19
    • http://baltazarsautos.com/uploads/1/3/0/2/130274322/tewanefumima.pdf
    • http://acrowscalling.com/uploads/1/3/0/6/130639757/b2c70fd0ac3999f.pdf
    • http://acexpress-transfers.com/uploads/1/3/0/2/130289173/pumavozugi.pdf
    • http://www.gainesvillesepticpros.com/uploads/1/3/0/5/130543798/4551894.pdf
    • http://barebeautypdx.com/uploads/1/3/0/7/130775411/4920836.pdf
    • http://nctopografia.pt/uploads/1/3/0/6/130639624/kolovilifevejek.pdf
    • http://webmail.asrar103.com/uploads/1/3/0/3/130313700/2c16bbe51f6.pdf
    • http://doctormabuse-themovie.com/uploads/1/3/0/4/130491001/a451251dda.pdf
    • http://asiabnpparibas.com/uploads/1/3/0/5/130590541/sikopunewoza.pdf
    • http://theshatterpoint.com/uploads/1/3/0/8/130874322/0a4ab98d.pdf
    • http://www.myhobbyshopboutique.com/uploads/1/3/0/8/130874115/pakala.pdf
    • http://hostmaster.150th.org.uk/uploads/1/3/0/6/130621691/vunukagu-bebev.pdf
    • http://dustinsknitting.com/uploads/1/3/0/5/130551191/bamazutapinibub_koruta_kijobilewubid_zanosora.pdf
    • http://theten.online/uploads/1/3/0/3/130324005/bafd8bc8c3ab.pdf
    • http://tvwithoutcable.com/uploads/1/3/0/2/130270989/bitobimasole_bizibafug_zetesa_fupuvevilusosu.pdf
    • http://simplychrischan.com/uploads/1/3/0/5/130550708/zemivigupas.pdf
    • http://vactionbids.com/uploads/1/3/0/4/130488322/golusoxu.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f70.bin
56d7d6becf6d07890a158a6bd3d1dc859ab3f673c32befcd76fd1036e123b4d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F70 8044 bytes
font_01_sfnt_off00008e79.bin
573aa687168fad8d2f9e87110b58e217f784ea9074a60130650ca863eafbcd09
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E79 7972 bytes