Malicious PDF — malware analysis report

Static analysis result for SHA-256 7899fe5a7906323b…

MALICIOUS

PDF

33.8 KB Created: 2020-03-31 02:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb544e6b37499aa8d7301042767b194c SHA-1: f60fa5011eebc1781974db3747fb2e2637ece694 SHA-256: 7899fe5a7906323b28c5973214decbaf41d5576587cf63ba31bbf58ac5e1c551
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDFs, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body, though malformed, contains a URL that appears to be a lure for educational content, likely to disguise the malicious intent of directing users to a network of suspicious sites.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://therestylers.com/uploads/1/3/0/9/130969368/130969368.html#factoring+polynomials+worksheet+grade+10
    • http://www.hilendarski.com/uploads/1/3/1/3/131380316/xemute.pdf
    • http://reeljewelryllc.com/uploads/1/3/0/2/130289345/keremuvutotes.pdf
    • http://stonecreekoffice.com/uploads/1/3/0/9/130969628/lasisagazogesij.pdf
    • http://lanternsgame.net/uploads/1/3/0/3/130379462/woreka_nivesu.pdf
    • http://costassolutions.com/uploads/1/3/0/2/130288962/1e28e8.pdf
    • http://debbiewestergaardtuepah.com/uploads/1/3/1/3/131381703/xeneboralugija.pdf
    • http://mikeandcompanyroofing.com/uploads/1/3/0/4/130483572/8614067.pdf
    • http://reisemobilansziel.com/uploads/1/3/0/5/130551922/9920912.pdf
    • http://milliehoffman.com/uploads/1/3/0/6/130621382/7266896.pdf
    • http://commonconverse.com/uploads/1/3/0/7/130775705/fojedemijirenu.pdf
    • http://smithfieldvawinebrewfest.com/uploads/1/3/1/3/131379945/3277089.pdf
    • http://globalstrategicresearchinstitute.com/uploads/1/3/0/4/130483753/1874968.pdf
    • http://starfishmakeupstudio.net/uploads/1/3/0/4/130483249/tomuzazesoka.pdf
    • http://towtruckirvine.com/uploads/1/3/0/6/130639348/7e359f02c.pdf
    • http://omarloy.com/uploads/1/3/0/4/130490221/kawatobu.pdf
    • http://quickeasycapital.com/uploads/1/3/1/4/131407668/9b3de490.pdf
    • http://referral360network.com/uploads/1/3/0/7/130776500/nejuluf.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b7e.bin
4c536335cf8215f9c2b922d496f67bfd1011cd1da83ee670e72e40496356b577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7E 7788 bytes

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