Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8e346f6451f7e…

MALICIOUS

PDF

37.7 KB Created: 2020-04-02 22:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1ea92ad30ab9da3bd1d04b428c8fa7b SHA-1: 63f70f108769607377ae057183e9ba2849963d92 SHA-256: 13d8e346f6451f7efbdfc1027ef20f4d53fce4bfcc20bf7052b472e9e659ed8f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. This suggests the document's primary purpose is to redirect users to these external resources, likely for SEO spam or to host further malicious content.

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://internalwebbuilder.com/uploads/1/3/1/0/131070880/131070880.html#mr+doob+internet+explorer
    • http://tarrankenthume.com/uploads/1/3/0/2/130288456/tupiliviloxut.pdf
    • http://hostmaster.naijalink.eu/uploads/1/3/0/6/130605069/dcd9c.pdf
    • http://groismantm.com/uploads/1/3/0/7/130776078/1653e9041098fd9.pdf
    • http://hallstattmalamutes.com/uploads/1/3/0/4/130476506/berir.pdf
    • http://curiumcyber.com/uploads/1/3/0/3/130379377/8085429.pdf
    • http://ctsretreat.com/uploads/1/3/0/2/130287866/denugegurotasusom.pdf
    • http://clearstreak.com/uploads/1/3/1/3/131380413/432526.pdf
    • http://thehyggehomeinfo.com/uploads/1/3/1/1/131163737/08abd3c894.pdf
    • http://doricwoodworking.com/uploads/1/3/0/2/130272500/towumesisaxatemepet.pdf
    • http://bluegrassdecals.com/uploads/1/3/0/4/130435729/satujetibimi_bojuxisaz.pdf
    • http://christopherediviaio.com/uploads/1/3/1/1/131163856/8579605.pdf
    • http://alimentosaude.com/uploads/1/3/0/3/130313836/tonawif.pdf
    • http://howtobuyorsellyourhome.com/uploads/1/3/1/0/131069750/504a2f.pdf
    • http://pilotprojects.net/uploads/1/3/0/5/130542865/d0459ca818da.pdf
    • http://chelseawoodsfitness.com/uploads/1/3/0/8/130874678/2391472.pdf
    • http://sleepeasydentistry.org/uploads/1/3/1/4/131406289/976d9f13a1888c.pdf
    • http://henrymolski.com/uploads/1/3/1/4/131406515/midoxosex.pdf
    • http://joanmkane.com/uploads/1/3/0/8/130874526/xutelavafufim-zizageziwotof-saxabiv-famoxubarizigoj.pdf
    • http://chrisarcherphotography.com/uploads/1/3/0/5/130544447/kifozeloruneka.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bab.bin
4d7b36024250f7c53078ece8fe23069219e20facffc891255edd3be40e83f257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAB 7396 bytes
font_01_sfnt_off00007878.bin
327e179081c81b43137f3594fb30ffd302f4eb4a4e6371ced732706b5640d83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7878 5068 bytes

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